Overflow is a single-player mini-game that was originally found in Crystal Sands and later added to the Sol Arcade. It was first introduced sometime during Beta Testing and can also be played using the den version of Overflow.
The objective of this mini-game is to create a continuous channel from the ocean at the top down to an empty basin (sand castle) at the bottom. This is accomplished by rotating square tiles (by clicking them) so that the water can reach the bottom. Once the channel has been created, the player must press the "Start Water" button and wait for the water to reach the basin. Many levels include bridges where water can travel in two possible directions in a single tile. The difficulty of the game can be increased from "Easy" to "Medium" or "Hard". Increasing the difficulty results in more tiles that must be rotated and more tiles that cannot be used to complete the channel.
Jammers can earn 2 Gems for every tile that the water covers. This does not increase for the harder difficulties and the higher levels; instead, the length of the channels increases to reward more gems overall.
There are seven achievements that can be earned by playing Overflow:
- Originally, each tile was worth 1 Gem, but this was changed to its current value as of June 14, 2014.
- There are a limited number of levels that repeat randomly. The game can be continued beyond level 200 and there is no known end to the levels.
- Occasionally, levels will have two or even three possible endings. Using the longer endings earn more Gems.