Super Game Boy hint book color codes (known as Super Game Boy Nintendo Strategy Guide):

Super Mario Land:
World 1:
1157-0970-9243
World 2:
0727-0920-1320
World 3:
0842-0719-2217
World 4:
1387-1371-3713

Super Mario Land 2:
Tree Zone:
5311-9613-5723
Macro Zone(Water levels):
0500-7220-3915
Mario Zone:
5311-9524-0915
Wario's Castle:
5312-0724-0915

Wario Land:
1. Rice Beach:
0691-3520-1243
2. Mount Teapot:
7110-6419-9352
3. Sherbet Island:
2422-1221-5359
4. Stone Canyon:
2421-5125-6348
5. S.S. Teacup
7097-0970-9709 (Palette 1-F)
6. Parsley Woods
7092-0619-9709
7. Syrup Castle
2421-3232-5390

Donkey Kong:
None

Metroid 2:
Phase 1:
1442-5670-4113
Phase 2:
0692-1540-7243
Phase 3:
1971-9220-1243
Phase 4:
2012-4319-7115
Phase 5 & 6:
7342-1534-9243
Phase 7 & 8:
1972-1579-8071
Final Battle:
1921-9726-3435

Zelda: Link's Awakening
1. Tail Cave
1148-3564-3416
2. Goponga Swamp
2427-7577-5903
3. Key Cavern
1012-2213-7859
4. Angler's Cave
7327-3279-6796
5. Catfish's Maw
1761-2878-0780
6. Twin Shrines
1431-9676-8768
7. Eagle's Tower
0711-1515-6243
8. Turtle Rock
0902-2778-3911

Kirby's Dream Land:
Stage 1:
7142-0419-9714
(Pages 55 & 56 missing in my book)
Stage 5:
1972-0428-9323

Kirby's Pinball Land:
Suggested:
1572-0617-9320

Tennis:
Brown Court:
1967-2672-6726

World Cup:
Bright Uniforms:
2422-1720-0243

Alleyway:
Stage 03:
2081-2820-3243
Stage 06:
2421-9619-9917

Dr. Mario:
5290-6802-1913

Mario & Yoshi:
Red Yoshi:
0501-9219-9918

Tetris:
Clearer Colors:
2430-7319-2144