My favourite microgame: Craft <item>, hard difficulty.
It's actually quite a good way to train your knowledge and memory of Minecraft recipes and to train your crafting speed. ;)
My favourite boss games: Colour Floor (both modes) and Lucky PvP, hard difficulty.
Lucky PvP on hard mode honestly just makes my day. I tried deflecting the meteor once and turned out accidentally hitting the cage for disqualified people. It exploded and everyone fell down in the arena and could still attack others. Now I do it everytime I summon the meteor - even though you can call it a bug, hehe. You should try it for yourself once if up for a laugh, lmao.