Unlimited energy:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 8522,173 
Unlimited energy (alternate):
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 6679,173
POKE 8512,10
SYS 16128 
Sentinel does not drain energy:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 6679,173 
Cheat mode:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 6679,173
POKE 7512,10
SYS 16128 

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Level Sentinels Password  
0 ? 06045387 
1 ? 02254153 
2 ? 88534263 
3 ? 36478937 
4 ? 81747818 
5 ? 53670951 
6 ? 76964997 
8 ? 76465990 
9 ? 58618450 
10 ? 67510065 
12 ? 40693494 
13 ? 26006956 
14 ? 05801695 
15 ? 78871093 
17 ? 87507474 
18 ? 89584716 
19 ? 73490728 
20 ? 91287667 
21 ? 82598093 
22 ? 79066357 
27 ? 52784469 
28 ? 37293679 
31 ? 58595499 
36 ? 58999784 
41 ? 61744991 
42 ? 74557326 
47 ? 97154749 
53 ? 68027574 
113 1 66416626 
254 5 61859426 
353 1 07970267 
513 7 36469008 
612 1 07946750 
726 4 58717139 
816 4 09852993 
998 2 74658546 
1111 7 55537879 
1210 5 82879051 
1313 4 58857943 
1402 5 98275559 
1504 6 72395773 
1620 3 89499676 
1730 5 20727788 
1830 3 88519875 
1900 1 42739240 
2000 6 91989545 
3077 8 91873453 
3302 8 90994779 
3604 8 42485715 
3651 8 99886447 
3872 8 67248676 
4152 8 87209116 
4484 8 61377689 
5139 8 18364677 
5221 8 39055528 
5358 8 48900126 
5440 8 54446568 
5645 8 05687059 
5810 8 75259448 
5977 8 24358276 
6142 ? 57429407 
6256 ? 36644244 
6557 ? 15461627 
6920 ? 36954279 
7174 ? 87745808 
7469 ? 28053043 
7609 ? 64774128 
7979 ? 69260595 
8076 ? 19490860 
8321 ? 79666978 
8476 ? 99703663 
8585 ? 42065833 
8678 ? 43402574 
9154 ? 68412419 
9198 ? 43249937 
9293 ? 10151064 
9396 ? 57677788 
9487 ? 47742501 
9534 ? 44998689 
9646 ? 36536934 
9795 ? 45956877 
9878 ? 83346694 
9917 ? 03898564 
9998 ? 98288136