Soaker block
From Inkipedia, the Splatoon wiki
Soaker blocks are a mechanic in Return of the Mammalians.
Description
Soaker blocks are similar to Sponges. There is a main block, and if it is hit with ink continuously, it can create lines of sponge blocks. There are arrows on them that point to where it will create sponges. Soaker blocks can also be hit with enemy ink. After a short period of time of activation, the soaker blocks will return back to the main block, deactivating it. You can also activate soaker blocks by throwing Smallfy at them.