Snake v2.51 [cheats] Start game as usual, then use the following level-codes: 

- Level Set 2 

BASTUS - 02 
STARTREST - 03 
IKLEX - 04 
XENON - 05 
VAMPUS - 06 
NUBUK - 07 
IBURIS - 08 
CERBER - 09 
VIMBELDAN - 10 
TIBIC - 11 
MAJICK - 12 
FEBBI - 13 
XIKEBY - 14 
NMIHY - 15 
HYBHY - 16 
KCBVCCC - 17 
GEBIXIX - 18 
MKCBI - 19 
BCCKEOG - 20 
YBBIIM - 21 
CIBER - 22 
LIGXIM - 23 
NEKNC - 24 
EBIJBM - 25 
HMIXY - 26 
MBNECEL - 27 
NMIKIB - 28 
EXIBET - 29 
BASIS - 30 
GIEBLE - 31 
HYMIX - 32 
YBECBELL - 33 
HIXEX - 34 
IXEGL - 35 
MBHI - 36 
KMIXI - 37 
HYXYB - 38 
MNYEL - 39 
KMMII - 40 
KENCEN - 41 
MMXI - 42 
OIXBIX - 43 
BEGCEL - 44 
VIGCEBEU - 45 
MBIXEL - 46 
EKIYL - 47 
YXCEBEL - 48 
BIMIXI - 49 
QUITER - 50 


- Level Set 3 

ZMM - 02 
MAMZ - 03 
ARAS - 04 
FAPIR - 05 
NGZM - 06 
MELE - 07 
ARMZ - 08 
FMM - 09 
FMZZ - 10 
XX - 11 
DMFM - 12 
MAAA - 13 
EAFLMZ - 14 
BADA - 15 
YA - 16 
FINIT - 17 
APAX - 18 
GZM - 19 
MZNU - 20 
AYZIS - 21 
PADAP - 22 
VALID - 23 
AGA - 24 
SFIR - 25 
PAF - 26 
AFIN - 27 
DATA - 28 
YGSA - 29 
FAPPM - 30 
GINA - 31 
AFAF - 32 
EAFCA - 33 
NFIL - 34 
AFMZ - 35 
GCAFG - 36 
DAZA - 37 
EDF - 38 
MDRIZ - 39 
SAFER - 40 
YANA - 41 
UNIX - 42 
UNAS - 43 
ALLA - 44 
ALBINELLA - 45 
LIMZA - 46 
ZMDE - 47 
AMZIR - 48 
NAFDCGE - 49 
SXGFG - 50 


- Christmas Levels 

TREBCE - 02 
EGISTER - 03 
IZISM - 04 
NISYX - 05 
FOREST - 06 
TCCCCC - 07 
IZER - 08 
NEYE - 09 
MERRY - 10 
HAPPY - 11 
LENTER - 12 
GETIT - 13 
NIKZ - 14 
MINDER - 15 
JULITU - 16 
QSTINN - 17 
HUNT - 18 
TIXIC - 19 
BOREY - 20 
TASER - 21 
IQURIS - 22 
XILIX - 23 
STILUS - 24 
INVOI - 25 
BASMAN - 26 
XINAS - 27 
SINTUSB - 28 
LIVI - 29 
OOSTIS - 30 
BANIX - 31 
OTSUTSI - 32 
INHSIN - 33 
MINKI - 34 
VASIX - 35 
INTER - 36 
OKINOT - 37 
LABIRIS - 38 
MALVIN - 39 
VAVEL - 40 
YTNHOT - 41 
TSQUVSI - 42 
HQUTSC - 43 
HAUTSI - 44 
ISHOI - 45 
IVONUTSI - 46 
DEEPFOREST - 47 
RELGAM - 48 
BIGSTER - 49 
FINLAKEM - 50 


- In Spring Levels 

HNYY - 02 
YUOHYN - 03 
UFOUG - 04 
RUOED - 05 
ZSNYOH - 06 
HIIII - 07 
UFYN - 08 
RYEY - 09 
QYNNE - 10 
TLLE - 11 
PYRYN - 12 
YHUH - 13 
QURXYN - 14 
VIPUHI - 15 
MOHURR - 16 
TIHR - 17 
HUDUL - 18 
SNYE - 19 
HOYN - 20 
UMINO - 21 
DUPUD - 22 
OHUPIO - 23 
URJISU - 24 
OGRE - 25 
DURO - 26 
OURIHO - 27 
PUJU - 28 
MSOHUO - 29 
RUDDY - 30 
SHOIHOU - 31 
URTOUR - 32 
QURWU - 33 
ZERO - 34 
URHYN - 35 
SWURSH - 36 
PUNOU - 37 
QPIR - 38 
JJYP - 39 
EHRTSH - 40 
HOMIJOU - 41 
TMIHOL - 42 
TIHOU - 43 
UOTSU - 44 
UJSROU - 45 
XYLZIXNOU - 46 
NYPQ - 47 
UOHYN - 48 
ZURPWSQ - 49 
GLAASERS - 50 


- Abstract Levels 

VPGG - 02 
GKQVGP - 03 
KXQKY - 04 
LKQ2 - 05 
DMPGQV - 06 
GOWW - 07 
KXGP - 08 
LGG - 09 
OGPP - 10 
JRR - 11 
NGLGP - 12 
GVKV - 13 
OKLFGP - 14 
HWNKVW - 15 
SQVK - 16 
JWVL - 17 
VKZKR - 18 
MPG - 19 
VQGP - 20 
KSWPQ - 21 
ZKNKZ - 22 
QVKNWQ - 23 
KLTWMK - 24 
QYL - 25 
ZKLQ - 26 
QKLWVQ - 27 
NKTK - 28 
SMQVKQ - 29 
LKZZG - 30 
MVQWVQK - 31 
KLJQKL - 32 
OKLIK - 33 
DLQ - 34 
KLVGP - 35 
MIKLMV - 36 
NKPQK - 37 
ONWL - 38 
TTGN - 39 
VLJMV - 40 
VQSWTQK - 41 
JSWVQR - 42 
JWVQK - 43 
KQJMK - 44 
KTMLQK - 45 
FGRDWFPQK - 46 
PGNO - 47 
KQVGP - 48 
DKLNIMO - 49 
YRMLM - 50