Cavegame.IO is an online multiplayer game, in which players control cavemen and try to survive with simple tools. It is inspired by the Minecraft game, which has the same graphics.
You start the game with pickaxe and sword. Gathering resources to build yourself a base, and food to enhance the character. You can trade and swap items or can fight with the others, depending on what you like.

How to play Cavegame.IO:

WASD to move, left mouse to attack and interact, number keys for switching items, shift to sneak, E to open menu.