The goal is to rescue shipwrecked sailors by picking them up from their boat (and before it sinks).
So, the turtle must first touch a boat so the shipwrecked sailor can climb onto its back.
It then needs to head to the hospital (the little house that appears randomly in a corner of the screen) to save them.
However, the turtle must watch out for piranhas that are hunting it and want to devour it!
Fortunately, it can drop a decoy (using the spacebar) that will distract (and freeze) a piranha for a certain amount of time.
Decoys sometimes appear in the center of the screen: you need to collect them to refill your bag.
Graphically, it’s certainly not very pretty since it’s a VG5000 game… BUT all the fun comes from the gameplay, which quickly turns out to be VERY addictive.