Subuilder

PLAY IN FULLSCREEN

Game does not have any saves.

R - restart this try
Rightclick on block - see this block info

Rightclick on block on the grid -delete

If you feel like block you've just clicked disappeared, click on the trash bin.

So basically your goal is to get to -800 and bring to the surface TOP SECRET block.  You can buy new building blocks in the shop. You can get coins by selling blocks you've brought to the surface. To catch blocks underwater use plunger, magnet or metal plunger. Just activate plunger when it's near a block you want to catch.

When you are bored. To get free coins: in shipyard, when shop is closed, HOLD C and press L couple times.