From the hub of the Aquatic Fun Center, proceed to the Amazon Arcade, where an angry Scarlet is located. Here, you'll have to win the games scattered around the arcade to earn prizes that Octodad can give to Scarlet. On Xbox and Steam, you'll have to win some games by cheating for an achievement. Start by approaching Scarlet to "talk" to her, then proceed to climb onto the fish toss game to find a tie (1/3) up on the rocks to the right. The fish toss game is won by knocking over all logs with thrown fish, but you can cheat at it by simply walking up to the logs and knocking them over with Octodad's tentacles. Make sure all logs fall into the water to earn a plushie as a prize, which you can give to Scarlet.
The claw machine can be won by moving the claw with the joystick and lowering it with the button to retrieve a prize inside. Octodad can cheat at it by stepping inside the machine and simply grabbing one of the plushies that lay around. Stepping inside will also allow you to see a tie (2/3) that you can grab. There are three more games that Octodad can cheat on for the achievement: air hockey, fruit blaster, and basketball. For air hockey, step onto the table and block the puck with Octodad's body; send the puck into the opponent's goal for a prize. For fruit blaster, place Octodad's body between the apples; this will cause them to drop as they bump into him. For basketball, simply walk up to the net with the ball in hand and continuously place it through the net while holding onto it.
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There are three more games to complete: pump the fish next to Scarlet, yank the lever to the other side of Scarlet as far as you can, whack the eels, stop the saws from falling onto the bottom of the table by sweeping them to either side of the table with Octodad's arm, and drop the ball in the drip dropper game so that it falls into the goal. Winning these games not only earns Octodad extra prizes for Scarlet, but a tie (3/3) can be found behind the final prize. Somewhere along the way, the tank behind Scarlet will begin leaking. Grab a basketball and plug the leaking hole in the tank with it for an achievement/trophy. After plugging the first hole, the water will start to flow more heavily, unplugging the hole and causing three more holes to appear. You can use the basketball to plug the hole again, and use the plushies that come falling to plug the other two holes. Plug four more holes and exit the Amazon to complete the stage.