You play as a fat guy, your goal is to get to the boss and defeat him in battle. The boss is protected by several dense walls, in order to break through them you need to gain mass. Eat junk food, avoid vegetables (who likes to eat broccoli anyway?). Coins are scattered throughout the level, collect them to take pride of place on the leaderboard.
To move left and right, use the right and left arrows on your keyboard (also A and D). Or hold down the left mouse button and move it in the desired direction.
On mobile devices, swipe in the desired direction is used to move.