When u r at the last challenge with the gatekeeper there is another way to get passed the Blockhead. Go in the room with the ledges and on the ledge with the crack use cherry bomb to open it. Then have Ammy double jump and as she is in mid air u go to the brush screen and look for a cherry blossom beyond the hole then draw a line from it to her. Then turn around and u will see a long ledge on the left side of ur screen. Break all the pots on it to get to the other side where the gatekeeper awaits u and start the final challenge. Good luck to all of u at the top of Oni Island!