Recipe for LADDER is: BIG OLD UP ARROW and WOODEN PLATFORM. LADDER is in platforms category. Lunch brake plant. Not for speed eaters though. Not much exp to be gained from breaking this. 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 LADDER. Profiting with this might be questionable. Blockratio of LADDER is a mystery. Maybe you can check the wiki for <a href="https://growtopia.fandom.com/wiki/Ladder">ladder</a>