Nothing 'wrong', but the reason for the multiples of 8 was likely because sprites back then needed masks so that they could handle 'holes' properly. This was in

Nothing 'wrong', but the reason for the multiples of 8 was likely because sprites back then needed masks so that they could handle 'holes' properly. This was in the days before alpha channels, so there'd be spritemask instead - essentially a 2-colour sprite that acted like a single-bit alpha channel. And if your sprite is a multiple of 8-pixels wide, then your spritemask takes up a whole-number of bytes, you can do funky low-level bit-twiddling to handle occlusions and it's more efficient in terms of memory space.