Wood blocks are not cleared by color. You break them by pushing enough Hammers to the front of the pig line.
Woods and Hammers is a blocker feature in Pixel Flow. The Wood covers hidden pixels on the board, so you cannot use those pixels until the wood breaks. To break it, you need to find the Hammer pigs in the pig sequence and push them to first place in line.
The tricky part is that the Hammers are mixed into the pig queue. You cannot just tap randomly. If you send out the wrong pigs too early, your waiting slots fill up, the board jams, and you may lose before the wood even opens.
So if the Wood shows 3, you need to push 3 Hammers to the front before that Wood opens.
The Wood is usually guarding pixels you badly need. That means the board may look short on clearable colors at first, but the real answer is trapped behind the Wood.
The danger is the pig queue. You are not only clearing colors. You are also digging through the sequence to reach the next Hammer without wasting too many waiting slots.
Bad tapping causes this:
Clean play is about making space while counting where the Hammers might be.
In many levels, the Hammers are spread through the columns in a pattern.
Count Hammers by column. Seriously. If you find 1 Hammer in the left column and 1 Hammer in the middle, but the Wood needs 3, the last one is probably sitting in the column that has not paid out yet. Push that side carefully instead of clearing random pigs just because they match the board.
Woods and Hammers is basically a queue-reading test. Break the Wood first, free the hidden pixels, then clean the level. Do not let the waiting slots decide the game for you.
