This is a minecraft mini game I have made, The rules are simple: Don't touch the red, Get to the green, reset button is in the corner. Good luck. If you die, just hit respawn.

ok, not enough explanation? whenever you step on a powered repeater, it kills you and sends you back to the start. whenever you step on the lime wool it gives you an emerald and sends you back to the start. There will be a line of powered repeaters on the right in addition to the random pulses. the line on the right gets bigger every time you die, and every few seconds. when looking from the blue, at the green, the reset button will be to your left. the goal of the game is to gather as many emeralds as you can. Keep inventory is on so you don't lose your progress every time you make a mistake. Pro Tip. You can jump over the repeater pulses. This uses @e so you need 1.8 or one of it's snapshots to play it.