To use the redstone timer stand on the black wool platform at spawn and press the button. Then watch. To use the human launcher, stand in the middle of the ring of tnt and press the button and stay there. You will be shot up. To reset it, fill back in the ring of tnt and it is ready for use again. To use the tnt cannon, hit the lever on the cobblestone nearest to the ground, and then about 4 seconds later hit the lever on top. Watch that tnt fly. To reset it, turn off both levers, then break and replace the redstone repeater. fill back in the tnt where it needs to go, and it's ready for use once again. Bye! Have fun!