Ducklings is an awesome free online game that features a duck as the main character and a simple objective to rescue small ducklings that are scattered across the lake. You are a duck now, swim around the lake and rescue other small duckings, try to collect as many as you can, bring them to your nest, and complete challenges.
Controls:
Just use your mouse to control your character, use it for direction (point the cursor on a specific part of the map, and your character will automatically swim there). Also play rocket league unblocked version for free.