This game seems to be one of the kind "did you even tried yourself?". Really, did you? The cube simply disappears from time to time without any reason. Ok, most often when i hold it over a torch, so you could argument with "it's melting". But on level 2 i couldn't even pass the first mimic. So no torch. Anyway, in the case of the missing cube, the level is over and should restart. BTW, a reset button is essential. I guess you would have realized this if you tried your game by yourself.
And that's basically the problem:
- Cube gone,
- but no reset button,
- reloading the page,
- have to start all over from level one
(to be honest, the fares i managed to get was level 2 one time because i needed about 6 tries to pass level 1 without the glitch or what ever you whana call it, before deciding to write you this)
Playing on win7 with FF, just for the case this helps you finding the bug.