diff --git a/gamemanager.s b/gamemanager.s
index c9038f5..a199e30 100644
--- a/gamemanager.s
+++ b/gamemanager.s
@@ -63,6 +63,15 @@ beginGameplay:
 	jsr clipTerrain
 ;	jsl renderTerrainSpans	; Part of the now disabled fill-mode renderer
 
+;	lda #7
+;	sta PARAML0
+;	lda #50
+;	sta PARAML1
+;	ldy #3
+;	jsr craterTerrain
+;	jsr compileTerrain
+;	jsr clipTerrain
+
 gameplayLoop:
 	jsr kbdScan
 ;	BORDER_COLOR #$F
@@ -164,6 +173,12 @@ gameplayEndTurnCondition:
 	jsr endTurn
 
 gameplayLoopEndFrame:
+	lda singleStep
+	beq gameplayLoopEndFrameCont
+	lda #1
+	sta paused
+
+gameplayLoopEndFrameCont:
 	lda quitRequested
 	beq gameplayLoopContinue
 	jmp quitGame
@@ -228,12 +243,15 @@ trackActiveShotDone:
 ; Handles changing the active player
 ;
 endTurn:
-	lda currentPlayer
-	inc
-	cmp #NUMPLAYERS
-	beq endTurnWrap
+	lda #0			; HAAAAX
 	sta currentPlayer
 
+;	lda currentPlayer
+;	inc
+;	cmp #NUMPLAYERS
+;	beq endTurnWrap
+;	sta currentPlayer
+
 endTurnRefresh:
 	jsr processTurnForProjectiles
 
@@ -386,6 +404,8 @@ projectileActive:
 	.word -1			; Y offset of active shot
 paused:
 	.word 0
+singleStep:
+	.word 0
 globalWind:
 	.word 0				; 12.4 velocity
 
@@ -399,3 +419,4 @@ mapScrollPos:
 ;	.word 0
 rightScreenEdge:
 	.word 160-GAMEOBJECTWIDTH/4-1
+
diff --git a/gameobject.s b/gameobject.s
index 7bf1940..65e3b02 100644
--- a/gameobject.s
+++ b/gameobject.s
@@ -59,7 +59,7 @@ placeGameObjectOnTerrain:
 ; vramPtr
 ;
 ; PARAML0 = Pointer to X,Y (16 bits each)
-; X => Offset to upper left corner of VRAM, or -1 if offscreen
+; X => Offset to upper left corner of VRAM, or ffff if offscreen
 ;
 ; Trashes SCRATCHL
 ;
@@ -100,7 +100,7 @@ vramPtr:
 	bra vramPtrDone
 
 vramPtrSkip:
-	ldx #-1
+	ldx #$ffff
 
 vramPtrDone:
 	RESTORE_AY
@@ -120,14 +120,20 @@ renderGameObject:
 
 	; Find gameobject location in video memory
 	jsr vramPtr
-	cpx #0
-	bmi renderGameobjectDone
+	cpx #$ffff
+	beq renderGameobjectDone
 
 	; Call compiled sprite code
 	txy
+	SAVE_AXY				; DEBUG BOUNDS RENDER
 	clc
 	jsr DrawSpriteBank
 
+	RESTORE_AXY				; DEBUG BOUNDS RENDER
+	lda #11					; DEBUG BOUNDS RENDER
+	clc						; DEBUG BOUNDS RENDER
+	jsr DrawSpriteBank		; DEBUG BOUNDS RENDER
+
 renderGameobjectDone:
 	RESTORE_XY
 	rts
diff --git a/gscats.2mg b/gscats.2mg
index 4f8cae0..e0960e9 100644
Binary files a/gscats.2mg and b/gscats.2mg differ
diff --git a/input.s b/input.s
index 17222c9..ba3e978 100644
--- a/input.s
+++ b/input.s
@@ -38,6 +38,8 @@ kbdScan:
 	beq kbdScanESC
 	cmp #(127 + $80)
 	beq kbdScanDEL
+	cmp #('=' + $80)
+	beq kbdScanEquals
 	cmp #(9 + $80)
 	beq kbdScanTab
 
@@ -115,6 +117,13 @@ kbdScanDEL:
 	sta paused
 	rts
 
+kbdScanEquals:
+	BITS16
+	lda #1
+	sta singleStep
+	stz paused
+	rts
+
 kbdScanTab:
 	BITS16
 	ldy currentPlayer