Enter at the input code area on the opening screen:

Stage 1 TRGHTR Stage 9 GNRLMN
Stage 2 TDBWL Stage 10 HTTTRT
Stage 3 MSTRMN Stage 11 ZBTSRL
Stage 4 TLLTRS Stage 12 HTKTTN
Stage 5 SCRDCT Stage 13 PTSPNS
Stage 6 STPDMN Stage 14 HXMSTR
Stage 7 BLZZRD Stage 15 VRCLN
Stage 8 SRFPNK Stage 16 BTTLN