diff --git a/src/mods/t00only.a b/src/mods/t00only.a
index 0895241..2b1a1d0 100644
--- a/src/mods/t00only.a
+++ b/src/mods/t00only.a
@@ -114,6 +114,7 @@ AnalyzeT00
          !source "../patchers/muserwts.a"
          !source "../patchers/artsci.a"
          !source "../patchers/springboard.a"
+         !source "../patchers/hoffman.a"
 
 ;add only above this line
 
diff --git a/src/patchers/hoffman.a b/src/patchers/hoffman.a
new file mode 100644
index 0000000..d55b64d
--- /dev/null
+++ b/src/patchers/hoffman.a
@@ -0,0 +1,47 @@
+;-------------------------------
+; #HOFFMAN
+; delayed check for timing bits
+; and nibbles in track seam
+;
+; tested on
+; - Good Thinking! Cause and Effect Level Two (Hoffman Educational Systems)
+; - Good Thinking! Details Level One (Hoffman Educational Systems)
+; - Good Thinking! Details Level Two (Hoffman Educational Systems)
+; - Good Thinking! Drawing Conclusions Level Two (Hoffman Educational Systems)
+; - Good Thinking! Fact & Opinion Level Two (Hoffman Educational Systems)
+; - Good Thinking! Main Idea Level One (Hoffman Educational Systems)
+; - Good Thinking! Main Idea Level Two (Hoffman Educational Systems)
+; - Good Thinking! Predicting Outcomes Level One (Hoffman Educational Systems)
+; - Good Thinking! Sequencing Events Level Two (Hoffman Educational Systems)
+;-------------------------------
+!zone {
+         bit   gMode      ; nothing to do here in verify-only mode
+         bpl   .exit
+         lda   #$0C
+         sta   gDisplayBytes
+         ldx   #$00
+         ldy   #$19
+         jsr   compare    ; and T00,S0C,$00 ==
+;
+         LDA   #$07
+         STA   $B7EC
+         LDA   #$00
+         STA   $B7F4
+         STA   $B7F2
+         JSR   $03E3
+         JSR   $03D9
+         LDX   $B7E9
+         LDA   $C089,X
+;
+         bcs   .exit
+         lda   #s_hoffman
+         jsr   PrintByID
+         lda   #$0C
+         ldx   #$00
+         ldy   #$01
+         jsr   modify     ; then set T00,S0C,$00 =
+;
+         RTS
+;
+.exit
+}
diff --git a/src/strings/en.a b/src/strings/en.a
index 27374ed..a9e5e9b 100755
--- a/src/strings/en.a
+++ b/src/strings/en.a
@@ -130,6 +130,7 @@ StringTable
          !word .springboard
          !word .hallabs
          !word .holle
+         !word .hoffman
 ;
 ; Text can contain substitution strings, which
 ; are replaced by current values at runtime. Each
@@ -155,7 +156,7 @@ StringTable
 ; can be set directly before calling PrintByID.
 ;
 .header
-         !text "Passport by 4am               2019-04-03",$00
+         !text "Passport by 4am               2019-04-04",$00
 .mainmenu
          !text "________________________________________",$8D,$8D,$8D,$8D,$8D,$8D,$8D
          !text "              "
@@ -478,4 +479,6 @@ StringTable
          !text "T%t,S%0 Found HAL Labs protection check",$8D,$00
 .holle
          !text "T00,S00 Found Holle bootloader",$8D,$00
+.hoffman
+         !text "T%t,S%0 Found Hoffman protection check",$8D,$00
 }
diff --git a/src/strings/enid.a b/src/strings/enid.a
index 23e488b..3d74427 100644
--- a/src/strings/enid.a
+++ b/src/strings/enid.a
@@ -116,4 +116,5 @@ s_dakin5 =     $6E
 s_springboard =$6F
 s_hallabs =    $70
 s_holle =      $71
-STRINGCOUNT =  $72
+s_hoffman =    $72
+STRINGCOUNT =  $73