Kimon

A showdown between two demons to decide who will be the Demon Knight. There are are two demons - blue and red. Red is stronger and can easily destroy blue to win. Attacks are nullified over red demon who lacks will power to fight, such as the case of blue demon. So to make the game fare Demon King himself made an arena of blocks and hid a gate within one of the blocks which can be used to win. Gate will only be revealed to blue demon but will be destroyed by red demon. If gate is destroyed blue demon seeing no escape gains enough will power to battle red demon to win.