played 1-1~3-4
found quite few problems
1. the warp zone in 1-2 doesn't work
2. every castle level crashes when i hit the switch at the end, include 1-4, 2-4, 3-4
3. there's a ground glitch on 3-2 where the mario will fall down under the snow, around 1 block down.
4. i think the 1-1 first pipe...