if you mean finishing a level, but only getting 8/9 of the collectibles, yeah thats a suck. basically have to replay the entire thing, even if you rocked it, for that one silly artifact that you missed.the game is a breath of fresh air though. its clear the devs put some thought into the game mechanics & therefore its fun to play. cant help but wonder what a 3D, non platformer, would be like. maybe the way nintendo games SHOULD have been back in the day. lol.you could also make the argument that the platforming helps to make the the game what it is though, so its a solid debate. i imagine a total stealth non killing run could be quite difficult, especially on a level like the 2nd; in which disaster lurks around almost every corner.