goood, stupid TYPO oO', been looking in the collision code forEVER to look where it was wrong... and it was in bouncex ; ;. So thats why left and right were always wrong, while top and bottom worked and when i used the top & bottom for left & right (but with x) it still wouldn't work... most .... stupid...mistake..ever Atm i use the left top + an offset: it maps a multiple of tilew onto the ship (so if ship is 36, and tilew = 16, there will be 4 pixels off, so 2 pixels left, 2 pixels right). That way when centered, you can fly through narrow tiles (which is only 32 pixels, else the ship would be considered too big) and i was hiding from ppl that were on msn (if i put myself online then the msn prog in linux still sees you online but invisible :/, but that hiding is over now ) neat, install MZ-Tools