Level Codes:
1: LXKYD12RKBL
2: LAH0KCVHST6
3: LSNAUB60OM1
4: LC29NQVKIH8
5: LI9DEBLSNAO
6: LBXZ0W1FXVS
7: LPEWX9AZ8I6
8: LCGO8YCP8EL
9: LEGL5R9ZPFA
10: LYPXW7EDRCU
11: LZ8NT4QO8ID
12: LQAX1SK2C0U
13: LLHZ72UK8HK
14: LS5T36D20IZ
15: L9LLPJ7IYOG
16: LN7UL3Y1R26
17: LU2OEUXJ7PD
18: LSMJRFD4TXA
19: LMI9QOZ7YLC
20: LZ3B61609YX
21: LY7NMK03NTA
22: L109FKPOSZS
23: LFBNC0Y7ZTU
24: L0S3VOGL7UM
25: L2COJK7A61H
26: LHF70CYW3F5
27: LRUAE8QL8S6
28: LOOPT8S9DPK
29: LEBBCD26RKT
Complete Level 28:
You have to use the special move (Space bar plus arrow key) in order to move rocks etc. without actually moving into that space.