Enter the following codes at the Password screen to unlock the corresponding level.

Unlock Level 2: QDJL

Unlock Level 3: ZZPD

Unlock Level 4: THKS

Unlock Level 5: MSLK

Unlock Level 6: KRPS

Unlock Level 7: VNVX

Unlock Level 8: YHXM

Unlock Level 9: FHMK

Unlock Level 10: LKJL

Unlock Level 11: RJHG

Unlock Level 12: RPGR

Unlock Level 13: WMVB

Unlock Level 14: KLPZ

Unlock Level 15: RVBS

Unlock Level 16: LMTQ

Unlock Level 17: GBGN

Unlock Level 18: YCGD