I'd like to take a minute to explain something I've seen around Blockland.
Everyone seems to have gotten it stuck in their heads that the Creeper add-on from RTB is broken in V21.
It isn't, and here i'll explain how to get it up and working, so hopefully this doesn't keep getting perpetuated.
1: Install the "Creeper" add-on from RTB, either in-game or using their website.
2: Launch Blockland
3: Click "Start A Game"
4: Select "Custom"
5: Go into the "Addons" tab, and scroll down until you get to "Gamemodes"
6: Deselect Gamemodes; Rampage, Speedkart, and Tutorial (Slayer can stay on, and creeper may or may not be in there, if it is, select it)
7: Hit Select in the bottom right
8: Launch
9: ???
10: Enjoy
TO BE CLEAR:
Not only have I joined servers since V21 with the creeper gamemode fully working, RTB preferences, tools and all, but I myself have used it.
Using it in-game can be slightly tricky if you've never done it before, you need to make a minigame and select the Creeper playertype, and you'll need to know a few commands like /startcreepgame or something along those lines.
The actual commands and a full guide are available on the forums or elsewhere. Look around for them, and all should work.
Thank you, and good night to all.