Level	Password
1	BZRC
2	CJHK
3	YZJS
4	CJWU
5	TNZE
6	BVLW
7	MMLQ
8	SKST
9	LUZF
10	CPJC
11	UVYK
12	KWYX
13	NOTI
14	ANPG
15	OWQL
16	FXEE
17	XWJY
18	KWOV
19	AEUQ
20	UOFY
21	XDCP
22	RFDS
23	UWTC
24	CFGK
25	WVKP
26	QIJB
27	RJOW
28	VQCK
29	SMAL
30	PXYF
31	JFUJ
32	VAWB
33	RZGA
34	XHKW
35	GLOT
36	LYTL
37	FNPF
38	AYQT
39	ZKDJ
40	MMNB
41	VJGQ
42	PBVB
43	SOVS
44	OAMO
45	CMMT
46	OCBC
47	CDSF
48	GBOC
49	BHNN
50	MVNW
51	NMDH
52	STNF
53	SAVI
54	SSGL
55	HXFG
56	WGWK
57	GNTK
58	UOQC
59	XHLY
60	LIPI
61	GXRE
62	DNVR
63	TSBW
64	HPXF
65	SQQF
66	LPOJ
67	SHFB
68	QTHK
69	XAFL
70	ROYH
71	DTHN
72	RAPQ
73	OPBG
74	LJOY
75	RBFJ
76	SKGV
77	SHWJ
78	JBKP
79	BFAO
80	DXKO
81	CIXG
82	TASX
83	OBXL
84	IAZO
85	ERXK
86	VQAL
87	BWNB
88	OCPI
89	SLPR
90	MLWJ
91	YRMY
92	YHDU
93	DZFW
94	BFTP
95	DHJV
96	XLFP
97	IUYS
98	IBZE
99	MAMW
100	NEXG

Level 0:
Enter TNZE (level 5 code) as a password then press A, B, or Start. Then, press Down. The level selection screen will appear, and it will be at level 0. Press Start to begin and you will be in an odd looking level. The password it reveals is "ADAM" at the level selection screen, but that code does not actually work.

Reversed levels:
Every level from 1 to 50 has a reversed version to it. Levels 51 to 100 are the reversed versions of levels 1 to 50.

Level	Reversed level
01	58
02	84
03	57
04	53
05	76
06	82
07	66
08	78
09	52
10	55
11	51
12	60
13	93
14	68
15	54
16	96
17	98
18	79
19	74
20	59
21	67
22	69
23	71
24	72
25	61
26	94
27	83
28	88
29	65
30	85
31	87
32	64
33	56
34	70
35	73
36	95
37	86
38	63
39	90
40	89
41	91
42	80
43	81
44	100
45	77
46	99
47	62
48	97
49	75
50	92
51	11
52	09
53	04
54	15
55	10
56	33
57	03
58	01
59	20
60	12
61	25
62	47
63	38
64	32
65	29
66	07
67	21
68	14
69	22
70	34
71	23
72	24
73	35
74	19
75	49
76	05
77	45
78	08
79	18
80	42
81	42
82	06
83	27
84	02
85	30
86	37
87	31
88	28
89	40
90	39
91	41
92	50
93	13
94	26
95	36
96	16
97	48
98	17
99	46
100	44