If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Eat or be eaten!
Choose between a shark or an ordinary fish.
Up and Down arrows to control the direction of the fish.
Don’t eat the green fishes and start a bonus by eating a red fish.
Playing as shark, eat as much fish as you can, while reaching the end of the waters in the shortest time.
It’s the same for the ordinary fish, except you have to survive.