Spirals Can "connect" to the same direction now. Screws with maps.

Some initial work on key doors. Namely altering the reverse side of Big Key doors that were unreachable in vanilla.

asm/spiral.asm

@@ -40,11 +40,18 @@ SpiralWarp: {
     lda $01 : and #$08 : lsr #2 : sta $0492 ;fix from layer calc 0->0 2->1
     ; shift lower coordinates
     lda $02 : sta $22 : bne .adjY : inc $23
-    .adjY lda $03 : sta $20 : bne .set53 : inc $21
-    .set53 ldx #$08
+    .adjY lda $03 : sta $20 : bne .upDownAdj : inc $21
+    .upDownAdj ldx #$08
     lda $0462 : and #$04 : beq .upStairs
     ldx #$fd
+    lda $01 : and #$80 : bne .set53
+    ; if target is also down adjust by (6,-15)
+    lda #$06 : !add $20 : sta $20 : lda #$eb : !add $22 : sta $22 : bra .set53
     .upStairs
+    lda $01 : and #$80 : beq .set53
+    ; if target is also up adjust by (-6, 14)
+    lda #$fa : !add $20 : sta $20 : lda #$14 : !add $22 : sta $22
+    .set53
     txa : !add $22 : sta $53
 
     lda $01 : and #$10 : sta $07 ; zeroHzCam check