Player Vs. Player (Game Quest #1) by Ash Wu

A new highly illustrated chapter book series set in both a Minecraft-style video game world and the real world of elementary school where friendships will be tested, courage will be discovered, and teamwork will always win!   Kat, Tai, and Alex are obsessed with the video game Otherworld. They strategize and play together all the time but are famous for their arguments while playing. They can’t help being passionate about what they love!Fresh off their latest fight, the kids discover that their school fundraiser is going to be an Otherworld tournament! All three of them are ecstatic, but they’re too stubborn to form a team while tensions are still running high. They’ll have to set all of that aside, though, when Kat, Tai, and Alex are magically zapped into Otherworld. With zombies to outrun and defenses to build, can the trio get it together long enough to get themselves out or will it be game over for good?