I'd like to present you a highly addictive game, "Bomberman". It's pretty closed to the original bomberman game.
So you spawn inside this tiny room.
Those chest are filled with lots of TNT.
By clicking the button, you'll descend into the actual level.
Destroy those sand walls by placing TNT above obsidian.
Now it's all about finding the key (redstone-torch) and the exit.
Use it, and descend into the next level.
You'll have to fight tons of mega-aggressive Zombies with TNT as well!
Check the official Bomberman Video.