castle grounds(cg)
bomb-omb battlefield(bob)
whomps fortress(wf)
cool cool mountain(ccm)
lethal lava land(lll)
shifting sand land(ssl)
pyramide inside(issl)
bowser in the fire sea(bitfs)
tall tall mountain(ttm)
tiny huge island(thi)
snowmans land(sl)
tick tock clock(ttc)
jolly rogger bay(jrb)
rainbow ride(rr)
big boo's haunt(bbh)
hazy maze cave(hmc)
wet dry world(wdw)
secret aquarium(sa)
arena(arena)
cavern of the metal cap(cotmc)
vanish cap under the moat(vcutm)
bowser in the dark world(bitdw)
bowser in the sky(bits)

example: /start ssl 
this will start the round in shifting sand land