Creepers

Level Codes:

EASY                 MODERATE             CHALLENGING          BRUTAL
Level  1: STEVEISDOG   19: CLCKNNMTTV   34: PPRRSCCBNF   54: GJJLMQNVVP
Level  2: PLKNDZRTVK   20: PCNSPZMDHM   35: WTHYRCHGNS   55: ZSNDFCZPKK
Level  3: TYNZXPRFSJ   21: NLQQBDNMGN   36: JGLHXQKKNM   56: BMNZXPYTWH
Level  4: KWFRTFTCSP   22: NNBCTCKGDY   37: BHRTYYTRHB   57: SPTTNBVWRM
Level  5: PYLNVXZSZH   23: CTBTCDPSMY   38: HSKPLYYQWR   58: JDWVCXMTYL
Level  6: KJHDSLWCBD   24: SSPQRCNXZZ   39: NSLCNCPHWY   59: CTSFPTJBXN
Level  7: HGKNDCPBCX   25: NQMNDBGGLN   40: KNSTKDNNSY   60: RWRQWTTXBD
Level  8: PLMKNJJPMT   26: CSTQRSWLSF   41: BPLJKQTYXZ   61: DPZLHGZVBD
Level  9: PSFWLKCNMW   27: MCDNSMBXRV   42: GWGLDYGPKH   62: ZTBGNTLKFP
Level 10: SNCCGHWPQX   28: SRTDSCHPRP   43: SSTSRFHTRY   63: MBNKHGCXHN
Level 11: YYRQQMNVZK   29: QSWDRFTGYH   44: BLNDKNPOSS   64: YRSFNCZPLS
Level 12: PYRTHZDHSL   30: YBYCYQRKNS   45: CRTHSTDQYS   65: PHJKNSZPSC
Level 13: FMNRXTKSCM   31: BSGTPWHWXW   46: GMFMLTPLSK   66: WLSNDRRNSC
Level 14: FCBLGHPWRT   32: DMGDDFZTMB   47: QPWRYTMCSF   67: TMSQLSTMBB
Level 15: CBSTPHQFCS   33: GPDLNSKYRP   48: NSDTFNCDSD   68: THNCGBVGBV
Level 16: FDNDBSLZCX                    49: RLPZHTYYRF   69: LMNKDNSFJG
Level 17: LLLVLSTKCM                    50: FRNDLSSNTZ   70: LMLCSMLFKP
Level 18: LRSYZPQYDN                    51: ZFHQWQFPSB   71: SPBDVZFGLM
                                         52: TPLKRCBQQS   72: FFVBSXZCPL
                                         53: MZVHQPSDPP   73: JFHKKGHXSJ