Watermelon Game is a Suika merge game that features classic, cute anthropomorphic fruit evolution and 2048 merge mechanics. The player's goal is to merge 11 different types of fruit that they drop into a clear box to create new fruit until they finally create a whole watermelon.
An anthropomorphic cloud that floats above the box holds each fruit before a drop. The player directs its movements, and each fruit drop. They must merge a pair of the same type of fruit to create a new one in the fruit evolution displayed on the right side of the screen. For example, two cherries create a strawberry, and two oranges create a red apple. The game makes play difficult by using realistic physics. The fruit drops and rolls against the other fruit and along the bottom of the container.
Watermelon Game displays the player's current score and their all-time best score in a floating, clear bubble near the upper-left corner. It helps the player make strategic decisions about the drops by showing the next available fruit in a clear bubble near the upper-right corner.
The player loses the game if they allow the fruit to pile up within the box enough for the fruit to stack above the front line at the top. They then restart and attempt to beat their best score.