Celtic Heart source code is freely available for download from HERE
No manuals found.
Snowy Mountains
Stage 1 - ****
Stage 2 - 9SDW
Stage 3 - QF2U
Stage 4 - 4TF0
Stage 5 - Z17K
The Cave
Stage 1 - 8ABS
Stage 2 - LI63
Stage 3 - KI8G
Stage 4 - LC6D
The Forest
Stage 1 - W2VR
Stage 2 - MT7T
Stage 3 - J55U
Stage 4 - 9KZL
Cheat Mode - DD89
Entering the above code will give you infinite lives (99). Additionally, you can then press the following keys during gameplay:
E - Finish level
I - Toggle invincibility