Play nick Games H2o games. Just Add water games On Nickelodeon games tips on level 1: - Collect mermaid coins - use your special power to help avoid the water hazards. tips on level 2: -Swim with the fishes and - collect as many mermaid coins as you can. Games Tips: Activate your special power to run through the water without losing a life. To help collect coins try lining up yours and the coins shadow, but you'll still need to jump if they're in the air!