diff --git a/res/ACTION.HGR.UNCOMPRESSED/ULTRACHECKERS b/res/ACTION.HGR.UNCOMPRESSED/ULTRACHECKERS
new file mode 100644
index 0000000..0f14103
Binary files /dev/null and b/res/ACTION.HGR.UNCOMPRESSED/ULTRACHECKERS differ
diff --git a/res/ACTION.HGR/ULTRACHECKERS b/res/ACTION.HGR/ULTRACHECKERS
new file mode 100644
index 0000000..9ae1637
Binary files /dev/null and b/res/ACTION.HGR/ULTRACHECKERS differ
diff --git a/res/ATTRACT/ULTRACHECKERS b/res/ATTRACT/ULTRACHECKERS
new file mode 100644
index 0000000..680b58c
--- /dev/null
+++ b/res/ATTRACT/ULTRACHECKERS
@@ -0,0 +1,8 @@
+#
+# Attract mode for ULTRACHECKERS
+# This file is automatically generated
+#
+
+ULTRACHECKERS=A
+
+[eof]
diff --git a/res/GAMES.CONF b/res/GAMES.CONF
index 6a8162b..5dea253 100755
--- a/res/GAMES.CONF
+++ b/res/GAMES.CONF
@@ -102,6 +102,7 @@
 11100,TSN.BASEBALL=The Sporting News Baseball/1988
 10001,TOMAHAWK=Tomahawk/1987
 00000,TRACK.AND.FIELD=Track & Field/1984
+00000,ULTRACHECKERS=Ultracheckers/1980
 00001,WARI=Wari/1988
 00000,WINTER.GAMES=Winter Games/1985
 01100,WORLD.GAMES=World Games/1987
diff --git a/res/SS/ACTBOARD.CONF b/res/SS/ACTBOARD.CONF
index f4a3a9a..7c4e76d 100644
--- a/res/SS/ACTBOARD.CONF
+++ b/res/SS/ACTBOARD.CONF
@@ -8,6 +8,7 @@ MICROCHESS
 GO.FOUR.IT
 ODIN
 PENSATE
+ULTRACHECKERS
 GO
 
 [eof]
diff --git a/res/SS/ACTTZ1.CONF b/res/SS/ACTTZ1.CONF
index 6699b02..0a8ad0e 100644
--- a/res/SS/ACTTZ1.CONF
+++ b/res/SS/ACTTZ1.CONF
@@ -5,6 +5,7 @@
 WORLD.KARATE2=WORLD.KARATE
 ZZFS
 TOMAHAWK
+ULTRACHECKERS
 WARI
 THE.DAM.BUSTERS
 
diff --git a/res/SS/CATBOARD.CONF b/res/SS/CATBOARD.CONF
index a430b4b..71fe5c5 100644
--- a/res/SS/CATBOARD.CONF
+++ b/res/SS/CATBOARD.CONF
@@ -5,6 +5,7 @@
 PENSATE
 ODIN
 GO.FOUR.IT
+ULTRACHECKERS
 REVERSI
 GO
 CHECKERS
diff --git a/res/SS/TITLETZ.CONF b/res/SS/TITLETZ.CONF
index e9e7dcb..38a380d 100644
--- a/res/SS/TITLETZ.CONF
+++ b/res/SS/TITLETZ.CONF
@@ -5,6 +5,7 @@
 THE.DAM.BUSTERS
 WINTER.GAMES
 TRACK.AND.FIELD
+ULTRACHECKERS
 WORLD.KARATE
 TOMAHAWK
 ZZFS
diff --git a/res/TITLE.HGR.UNPACKED/ULTRACHECKERS b/res/TITLE.HGR.UNPACKED/ULTRACHECKERS
new file mode 100644
index 0000000..58d05a0
Binary files /dev/null and b/res/TITLE.HGR.UNPACKED/ULTRACHECKERS differ
diff --git a/res/TITLE.HGR/ULTRACHECKERS b/res/TITLE.HGR/ULTRACHECKERS
new file mode 100644
index 0000000..e8f484a
Binary files /dev/null and b/res/TITLE.HGR/ULTRACHECKERS differ
diff --git a/res/dsk/ultracheckers (4am pack).po b/res/dsk/ultracheckers (4am pack).po
new file mode 100644
index 0000000..87cb469
Binary files /dev/null and b/res/dsk/ultracheckers (4am pack).po differ
diff --git a/res/history.md b/res/history.md
index 7a09d9d..d3c4f14 100644
--- a/res/history.md
+++ b/res/history.md
@@ -42,6 +42,7 @@
 - The Sporting News Baseball
 - Wari
 - Wipeout
+- Ultracheckers
 - Zig Zag Flag Shag
 
 ## Revision 1.0-alpha.3 / 20231114
diff --git a/res/notes/wishlist.txt b/res/notes/wishlist.txt
index 5de9aac..de21ca5 100644
--- a/res/notes/wishlist.txt
+++ b/res/notes/wishlist.txt
@@ -62,7 +62,6 @@ The World's Greatest Baseball Game (Enhanced Version) [4am crack][64K][supports-
 The World's Greatest Football Game [4am crack][64K]
 Top Fuel Eliminator (Activision) [4am crack][HGR-but-128K]
 Trick Shot (IDSI) [needs-crack][48K][supports-data-disk]
-Ultracheckers (Malibu Microcomputing) [needs-crack][48K]
 World Class Leader Board (Access Software) [64K]
 World Series Baseball
 
diff --git a/res/ports/ultracheckers/Makefile b/res/ports/ultracheckers/Makefile
new file mode 100644
index 0000000..e05030b
--- /dev/null
+++ b/res/ports/ultracheckers/Makefile
@@ -0,0 +1,51 @@
+# https://sourceforge.net/projects/acme-crossass/
+ACME=acme
+
+# https://github.com/mach-kernel/cadius
+CADIUS=cadius
+
+EXOMIZER=exomizer mem -lnone -P23 -f -q
+
+BUILDDIR=build
+DISKVOLUME=ULTRACHECKERS
+LOADER=$(BUILDDIR)/LOADER.SYSTEM\#FF2000
+EXE=$(BUILDDIR)/ULTRACHECKERS\#068000
+COMPRESSED=src/OBJ.X
+SOURCES=$(wildcard src/*.a) $(COMPRESSED)
+RES=$(wildcard res/*) $(wildcard ../common/res/*)
+BUILDDISK=$(BUILDDIR)/$(DISKVOLUME).po
+
+.PHONY: clean mount all
+
+$(BUILDDISK): $(EXE) $(LOADER) $(RES)
+
+$(LOADER): $(SOURCES) | $(BUILDDIR)
+	$(ACME) src/loader.a
+	$(CADIUS) REPLACEFILE "$(BUILDDISK)" "/$(DISKVOLUME)/" "$(LOADER)" -C
+	@touch "$@"
+
+$(EXE): $(SOURCES) $(COMPRESSED) | $(BUILDDIR)
+	$(ACME) src/ultracheckers.a
+	$(CADIUS) REPLACEFILE "$(BUILDDISK)" "/$(DISKVOLUME)/" "$(EXE)" -C
+	@touch "$@"
+
+$(RES): $(BUILDDIR)
+	$(CADIUS) REPLACEFILE "$(BUILDDISK)" "/$(DISKVOLUME)/" "$@" -C
+	@touch "$@"
+
+$(COMPRESSED):
+	$(EXOMIZER) src/OBJ@0x0800 -o "$@"
+
+mount: $(BUILDDISK)
+	@open "$(BUILDDISK)"
+
+clean:
+	rm -rf "$(BUILDDIR)"
+
+$(BUILDDIR):
+	mkdir -p "$@"
+	$(CADIUS) CREATEVOLUME "$(BUILDDISK)" "$(DISKVOLUME)" 140KB -C
+
+all: clean mount
+
+.NOTPARALLEL:
diff --git a/res/ports/ultracheckers/src/OBJ b/res/ports/ultracheckers/src/OBJ
new file mode 100644
index 0000000..21c8b51
Binary files /dev/null and b/res/ports/ultracheckers/src/OBJ differ
diff --git a/res/ports/ultracheckers/src/OBJ.X b/res/ports/ultracheckers/src/OBJ.X
new file mode 100644
index 0000000..96ef1d5
Binary files /dev/null and b/res/ports/ultracheckers/src/OBJ.X differ
diff --git a/res/ports/ultracheckers/src/loader.a b/res/ports/ultracheckers/src/loader.a
new file mode 100644
index 0000000..47fc736
--- /dev/null
+++ b/res/ports/ultracheckers/src/loader.a
@@ -0,0 +1,25 @@
+!cpu 6502
+*=$2000
+!to "build/LOADER.SYSTEM#FF2000",plain
+
+         !src  "../common/src/constants.a"
+         !src  "../common/src/macros.a"
+
+         +READ_ENTIRE_FILE parm_boot_open, parm_boot_read
+         jmp   (entry)
+
+parm_boot_open
+         !byte 3
+         !word filename
+         !word $2100
+         !byte 0
+
+parm_boot_read
+         !byte 4
+         !byte 1
+entry    !word $8000
+         !word $FFFF
+         !word 0
+
+filename
+         !text 13,"ULTRACHECKERS"
diff --git a/res/ports/ultracheckers/src/ultracheckers.a b/res/ports/ultracheckers/src/ultracheckers.a
new file mode 100644
index 0000000..26b733a
--- /dev/null
+++ b/res/ports/ultracheckers/src/ultracheckers.a
@@ -0,0 +1,48 @@
+!cpu 6502
+*=$8000
+!to "build/ULTRACHECKERS#068000",plain
+
+         !src  "../common/src/constants.a"
+         !src  "../common/src/macros.a"
+
+         jmp   start
+
+compressed_data
+         !bin "src/OBJ.X"
+FORWARD_DECRUNCHING = 1
+SHOW_PROGRESS_DURING_DECRUNCH = 0
+         !src  "../common/src/exodecrunch.a"
+
+start
+         +INIT_MACHINE
+!if * != $93CB {
+  !serious "Adjust prelaunch to patch JSR at ", *
+}
+         jsr   decrunch              ; compressed data contains target address
+         bit   GFXMODE
+         bit   PAGE1
+         bit   HIRES
+         bit   FULLGFX
+         lda   #$F9                  ; set by original bootloader
+         sta   $20
+         lda   #$E3
+         sta   $21
+         lda   #$F4
+         sta   $22
+         lda   #$15
+         sta   $23
+         lda   #$2F
+         sta   $24
+         lda   #$16
+         sta   $25
+         lda   #$00
+         sta   $3FE
+         sta   $3FF
+         jmp   $19BB
+
+get_crunched_byte
+         lda   compressed_data
+         inc   get_crunched_byte+1
+         bne   +
+         inc   get_crunched_byte+2
++        rts
diff --git a/src/index/artwork.idx.a b/src/index/artwork.idx.a
index 1a1fba8..41431e0 100644
--- a/src/index/artwork.idx.a
+++ b/src/index/artwork.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2647585
+         !be24  2656580
          !le16      630
diff --git a/src/index/attract.idx.a b/src/index/attract.idx.a
index b336a56..91adf81 100644
--- a/src/index/attract.idx.a
+++ b/src/index/attract.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2631872
+         !be24  2640787
          !le16     1543
diff --git a/src/index/cache00.idx.a b/src/index/cache00.idx.a
index b67fcaa..6ffc0de 100644
--- a/src/index/cache00.idx.a
+++ b/src/index/cache00.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2619253
+         !be24  2628034
          !le16      560
diff --git a/src/index/cache01.idx.a b/src/index/cache01.idx.a
index 39e877a..2f23151 100644
--- a/src/index/cache01.idx.a
+++ b/src/index/cache01.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2621925
+         !be24  2630744
          !le16      921
diff --git a/src/index/cache10.idx.a b/src/index/cache10.idx.a
index f4362f9..65be0e5 100644
--- a/src/index/cache10.idx.a
+++ b/src/index/cache10.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2625010
+         !be24  2633867
          !le16      903
diff --git a/src/index/cache11.idx.a b/src/index/cache11.idx.a
index 28c0af2..65ed9e4 100644
--- a/src/index/cache11.idx.a
+++ b/src/index/cache11.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2629038
+         !be24  2637933
          !le16     1349
diff --git a/src/index/count00.a b/src/index/count00.a
index 789f3de..5ee285f 100644
--- a/src/index/count00.a
+++ b/src/index/count00.a
@@ -3,4 +3,4 @@
 ;
 ; This file is automatically generated
 ;
-!word       41
+!word       42
diff --git a/src/index/count01.a b/src/index/count01.a
index f5e679b..8971ac4 100644
--- a/src/index/count01.a
+++ b/src/index/count01.a
@@ -3,4 +3,4 @@
 ;
 ; This file is automatically generated
 ;
-!word       60
+!word       61
diff --git a/src/index/count10.a b/src/index/count10.a
index a8d0669..301fdf9 100644
--- a/src/index/count10.a
+++ b/src/index/count10.a
@@ -3,4 +3,4 @@
 ;
 ; This file is automatically generated
 ;
-!word       62
+!word       63
diff --git a/src/index/count11.a b/src/index/count11.a
index 8da91e1..caeea3d 100644
--- a/src/index/count11.a
+++ b/src/index/count11.a
@@ -3,4 +3,4 @@
 ;
 ; This file is automatically generated
 ;
-!word       86
+!word       87
diff --git a/src/index/coverfade.idx.a b/src/index/coverfade.idx.a
index f357ff1..1bacced 100644
--- a/src/index/coverfade.idx.a
+++ b/src/index/coverfade.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2648215
+         !be24  2657210
          !le16      306
diff --git a/src/index/credits.idx.a b/src/index/credits.idx.a
index b8ef19e..58318c0 100644
--- a/src/index/credits.idx.a
+++ b/src/index/credits.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2648865
+         !be24  2657860
          !le16      336
diff --git a/src/index/decrunch.idx.a b/src/index/decrunch.idx.a
index 216fffd..d66fc64 100644
--- a/src/index/decrunch.idx.a
+++ b/src/index/decrunch.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2649201
+         !be24  2658196
          !le16      303
diff --git a/src/index/demo.idx.a b/src/index/demo.idx.a
index 1a7651c..b1bbf97 100644
--- a/src/index/demo.idx.a
+++ b/src/index/demo.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2119446
+         !be24  2128189
          !le16       69
diff --git a/src/index/dfx.idx.a b/src/index/dfx.idx.a
index ffeaecf..0fe83fc 100644
--- a/src/index/dfx.idx.a
+++ b/src/index/dfx.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2636055
+         !be24  2644970
          !le16     1640
diff --git a/src/index/dgr.fizzle.idx.a b/src/index/dgr.fizzle.idx.a
index 3d92b83..1ce2588 100644
--- a/src/index/dgr.fizzle.idx.a
+++ b/src/index/dgr.fizzle.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2648597
+         !be24  2657592
          !le16       67
diff --git a/src/index/dgr.idx.a b/src/index/dgr.idx.a
index ea1bf18..2b4cd62 100644
--- a/src/index/dgr.idx.a
+++ b/src/index/dgr.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2647573
+         !be24  2656568
          !le16       12
diff --git a/src/index/dhgr.idx.a b/src/index/dhgr.idx.a
index d8db8d9..fc26ddd 100644
--- a/src/index/dhgr.idx.a
+++ b/src/index/dhgr.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2646459
+         !be24  2655454
          !le16     1062
diff --git a/src/index/dtitle.idx.a b/src/index/dtitle.idx.a
index 73dba37..27f3f23 100644
--- a/src/index/dtitle.idx.a
+++ b/src/index/dtitle.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2643962
+         !be24  2652937
          !le16      365
diff --git a/src/index/fx.idx.a b/src/index/fx.idx.a
index 5467a84..0d000eb 100644
--- a/src/index/fx.idx.a
+++ b/src/index/fx.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2633415
+         !be24  2642330
          !le16     2640
diff --git a/src/index/gamehelp.idx.a b/src/index/gamehelp.idx.a
index e48369d..263a5a3 100644
--- a/src/index/gamehelp.idx.a
+++ b/src/index/gamehelp.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2638053
-         !le16     1485
+         !be24  2646968
+         !le16     1505
diff --git a/src/index/gr.fizzle.idx.a b/src/index/gr.fizzle.idx.a
index 58783c6..2591272 100644
--- a/src/index/gr.fizzle.idx.a
+++ b/src/index/gr.fizzle.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2648521
+         !be24  2657516
          !le16       76
diff --git a/src/index/gr.idx.a b/src/index/gr.idx.a
index e2b9d74..dc9f683 100644
--- a/src/index/gr.idx.a
+++ b/src/index/gr.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2647521
+         !be24  2656516
          !le16       52
diff --git a/src/index/helptext.idx.a b/src/index/helptext.idx.a
index 2526b9f..3392769 100644
--- a/src/index/helptext.idx.a
+++ b/src/index/helptext.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2648664
+         !be24  2657659
          !le16      201
diff --git a/src/index/hgr0.idx.a b/src/index/hgr0.idx.a
index 2f2ea40..7645ba7 100644
--- a/src/index/hgr0.idx.a
+++ b/src/index/hgr0.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2644327
+         !be24  2653302
          !le16      421
diff --git a/src/index/hgr1.idx.a b/src/index/hgr1.idx.a
index aa2503f..fcae93d 100644
--- a/src/index/hgr1.idx.a
+++ b/src/index/hgr1.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2644748
+         !be24  2653723
          !le16      209
diff --git a/src/index/hgr2.idx.a b/src/index/hgr2.idx.a
index e36c294..04c7106 100644
--- a/src/index/hgr2.idx.a
+++ b/src/index/hgr2.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2644957
+         !be24  2653932
          !le16      107
diff --git a/src/index/hgr3.idx.a b/src/index/hgr3.idx.a
index ac25dbc..d99c066 100644
--- a/src/index/hgr3.idx.a
+++ b/src/index/hgr3.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2645064
+         !be24  2654039
          !le16      292
diff --git a/src/index/hgr4.idx.a b/src/index/hgr4.idx.a
index 2be33cc..dfaaa25 100644
--- a/src/index/hgr4.idx.a
+++ b/src/index/hgr4.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2645356
+         !be24  2654331
          !le16      791
diff --git a/src/index/hgr5.idx.a b/src/index/hgr5.idx.a
index 7165932..ae88de0 100644
--- a/src/index/hgr5.idx.a
+++ b/src/index/hgr5.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2646147
-         !le16      285
+         !be24  2655122
+         !le16      305
diff --git a/src/index/hgr6.idx.a b/src/index/hgr6.idx.a
index 262d7cc..86417be 100644
--- a/src/index/hgr6.idx.a
+++ b/src/index/hgr6.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2646432
+         !be24  2655427
          !le16       27
diff --git a/src/index/joystick.idx.a b/src/index/joystick.idx.a
index ab921c6..1d7b23b 100644
--- a/src/index/joystick.idx.a
+++ b/src/index/joystick.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2649504
+         !be24  2658499
          !le16     2370
diff --git a/src/index/miniattract0.idx.a b/src/index/miniattract0.idx.a
index 317e8c4..8fef40b 100644
--- a/src/index/miniattract0.idx.a
+++ b/src/index/miniattract0.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2641295
+         !be24  2650230
          !le16      880
diff --git a/src/index/miniattract1.idx.a b/src/index/miniattract1.idx.a
index 4cf0c2e..cefc5ed 100644
--- a/src/index/miniattract1.idx.a
+++ b/src/index/miniattract1.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2642175
-         !le16      609
+         !be24  2651110
+         !le16      629
diff --git a/src/index/prelaunch.idx.a b/src/index/prelaunch.idx.a
index 64b9d7f..4ce3852 100644
--- a/src/index/prelaunch.idx.a
+++ b/src/index/prelaunch.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2630387
-         !le16     1485
+         !be24  2639282
+         !le16     1505
diff --git a/src/index/res.cover.idx.a b/src/index/res.cover.idx.a
index 2b55159..60706e7 100644
--- a/src/index/res.cover.idx.a
+++ b/src/index/res.cover.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24   835115
+         !be24   842795
          !le16     8184
diff --git a/src/index/res.help.idx.a b/src/index/res.help.idx.a
index dbe17e1..46b4451 100644
--- a/src/index/res.help.idx.a
+++ b/src/index/res.help.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24   851491
+         !be24   859171
          !le16     8184
diff --git a/src/index/res.title.idx.a b/src/index/res.title.idx.a
index d0f869b..75b23d9 100644
--- a/src/index/res.title.idx.a
+++ b/src/index/res.title.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24   843299
+         !be24   850979
          !le16     8192
diff --git a/src/index/search00.idx.a b/src/index/search00.idx.a
index e5c8ced..21d08c4 100644
--- a/src/index/search00.idx.a
+++ b/src/index/search00.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2617900
-         !le16     1353
+         !be24  2626643
+         !le16     1391
diff --git a/src/index/search01.idx.a b/src/index/search01.idx.a
index 46f2432..7732428 100644
--- a/src/index/search01.idx.a
+++ b/src/index/search01.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2619813
-         !le16     2112
+         !be24  2628594
+         !le16     2150
diff --git a/src/index/search10.idx.a b/src/index/search10.idx.a
index f8c8da6..4b6acc5 100644
--- a/src/index/search10.idx.a
+++ b/src/index/search10.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2622846
-         !le16     2164
+         !be24  2631665
+         !le16     2202
diff --git a/src/index/search11.idx.a b/src/index/search11.idx.a
index 8934ed6..d653b22 100644
--- a/src/index/search11.idx.a
+++ b/src/index/search11.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2625913
-         !le16     3125
+         !be24  2634770
+         !le16     3163
diff --git a/src/index/sfx.idx.a b/src/index/sfx.idx.a
index 483847b..08aa9c7 100644
--- a/src/index/sfx.idx.a
+++ b/src/index/sfx.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2637695
+         !be24  2646610
          !le16      358
diff --git a/src/index/slideshow.idx.a b/src/index/slideshow.idx.a
index c6d38a5..4ed74ae 100644
--- a/src/index/slideshow.idx.a
+++ b/src/index/slideshow.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2639538
+         !be24  2648473
          !le16     1757
diff --git a/src/index/title.idx.a b/src/index/title.idx.a
index e260159..8152725 100644
--- a/src/index/title.idx.a
+++ b/src/index/title.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2642784
-         !le16     1178
+         !be24  2651739
+         !le16     1198
diff --git a/src/index/xsingle.idx.a b/src/index/xsingle.idx.a
index 5983c01..054f6bb 100644
--- a/src/index/xsingle.idx.a
+++ b/src/index/xsingle.idx.a
@@ -4,5 +4,5 @@
 ; This file is automatically generated
 ;
          !byte 0
-         !be24  2617244
+         !be24  2625987
          !le16      656
diff --git a/src/prelaunch/ultracheckers.a b/src/prelaunch/ultracheckers.a
new file mode 100644
index 0000000..5e2b7b6
--- /dev/null
+++ b/src/prelaunch/ultracheckers.a
@@ -0,0 +1,18 @@
+;license:MIT
+
+!cpu 6502
+!to "build/PRELAUNCH.INDEXED/ULTRACHECKERS",plain
+*=$106
+
+    !source "src/prelaunch/common.a"
+
+         +ENABLE_ACCEL
+         lda   #$4C
+         sta   $93CB
+         jsr   $8000
+         +DISABLE_ACCEL
+         jmp   $93CE
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}