The Golem's Game! (Minecraft Stonesword Saga #5)

"Despite being a great Minecraft player, Morgan feels his leadership of the team slipping away as the next splinter of the Evoker King takes the form of a golem and challenges each member of the team to run a dangerous obstacle course. Normally they would work together, but this time they are each forced to face the challenge alone--with no second chances and a river of hot lava waiting for them if they fail!"--