Play as a neru (corsican for black) block, avoiding spikes, jumping over holes, and traveling through portals.
some important information regarding the game:
1) to unlock the ultimate challenge you need to get a time of 300 secs or less and 30 deaths or less
2)Blue buttons disable your teleportation ability
3)In many levels there are platforms that you cannot see, explaining why you can't jump or can't go any further