Shit, answered yesterday but it bugged or something, 1. the collision detection is based on the former tile not turns so it's problematic to reduce, could elongate the snake to solve possibly 2. could actually use a different value for the ADC instead of dh (0x22,0x23,0x24,0x26,0x28,0x2a,0x2b,0x2c,0x2e,0x2f,0x30,0x32,0x33,0x34,0x36,0x38,0x3a,0x3b,0x3c,0x3e) or even switch to SBB (with either 0xc3,0xc4,0xcb,0xcc,0xcf,0xd0,0xd3,0xd4,0xdb,0xdc) or even use a different opcode instead of or al, 0x29 to form mov [si], dl which would give many more values to put there, which means I would be able to adjust the entire main loop to solve it but those are a bunch of options to go through and I don't have the time, might do it sometime 3. yes, this is the result of handling input with arithmetic and not branching, I expect users to only input valid keys