I’ve found another bug/exploit:
I was able to replay with the builder’s hammer because I went straight to the level, where I already had it equipped. Not that I mind being #1 for a while, but I think I found this behavior on one other level as well. When going to a level from a link or by inputting the url directly, if you cancel out of the equip screen you can start the level with whatever equipment you used for the last level.
(not sure if this link will work, but here it is anyway: http://codecombat.com/play/level/cavern-survival?team=humans&opponent=548a78af971a8d4b073144d2)