Swimmer is an arcade game developed in 1982 by Tehkan (now known as Tecmo) and published by Centuri. The comic gameplay involves swimming up a river while avoiding logs and various marine life. The player collects fruit to score points and power up to knock enemies out. Players could swim from side to side to avoid obstacles, or press a button to dive under them. The aim of the game is to swim until the character reaches the treasure island. Source: Wikipedia, "Swimmer (arcade game)", available under the CC-BY-SA License.