You should definitely play it with a good gamer mouse with high sensitivity -- my cheap office hardware is just not precise enough to trace the proper path within the allotted time. Still, props for a very original concept. I did find it a bit unfair that red ninjas can just jump over the pits, whereas the blue guy sometimes falls through the floor by just clipping a pit corner. I think it would add an interesting strategic element if the enemy ninjas could fall, too, so you could effectively win on their turn if you ended your movement in a spot where all the remaining enemies would fall into pits as they tried to reach you.