From this page you can find all awesome stuff that you can create with BURGLAR MASK. You can find this item in face category. Plant 40, harvest 40, brake all the blocks, repeat. BURGLAR MASK gives experience points when broken. Hitting it will break it but you need to count the hits yourself. Seed mathematics is very complicated, but you should get at least 1 seed back from splicing BURGLAR MASK. Gemratio of BURGLAR MASK is a mystery. Maybe you can check the wiki for <a href="https://growtopia.fandom.com/wiki/Burglar_Mask">burglar mask</a> Will you get enough blocks to build something? You just have to find out yourself.