Recipe for CAVE ENTRANCE is: THE DARKNESS and CLIFFSIDE. You can find this item in hand category. Planting CAVE ENTRANCE and kicking back is the right attitude. Breaking this block will give you 9 experience points. CAVE ENTRANCE can be broken. You get at least 1 seed back (maybe more!) from splicing CAVE ENTRANCE. Will you strike it rich? You just have to count the gems yourself. Blockratio of CAVE ENTRANCE is a mystery. Maybe you can check the wiki for <a href="https://growtopia.fandom.com/wiki/Cave_Entrance">cave entrance</a>