This is one of those your trying to kill me feeling games but its fun. The hardest level was 33. I suggest put a water bottle above one of the fourth fifth or sixth columns and it would be a little easier. The hardest chests for me to find were levels 7 38424344 and 50. The bonus level is near impossible because of those small ladders floating in the air. I cant get past the bonus level. At level 49 there was a glitch near the boxes. You have to burn them through a wall and when I died near those boxes I respawned in the boxes and if you don't reach a checkpoint after you get a chest and you die you have to get the chest again.