Floaty Fight!

In Floaty Fight!, a.k.a. Schiffe versenken, players need guesswork and their powers of deduction to discover the whereabouts of all the opponent's floaties to win the game. In practice, this game has the same rules as Battleship but instead of five ships from lengths 2-5, each player has ten ships from lengths 1-4:

Four size-1 ships
Three size-2 ships
Two size-3 ships
One size-4 ship

Players place their ship on a gridded 10X10 piece of paper and keep track of their hits and misses with pencil.