When it is your turn, you may move any glop that has an empty tile within two squares of it (horizontally, vertically, or any combination). If you move one square away from your original position, you get to keep the original glop. If you move two squares away, the original glop must leap, and you lose it. In either case, you gain a glop in the square you move to, and all of your opponents' glops in bordering tiles become yours.
That's all for the rules, but the strategy of Ooze is left for you to discover!