SOLUTION par Terri SHEEHAN. Corrigé par Nicholas CAMPBELL. Testé par Kukulcan le 21/04/2022.

You start the game in Zagro Spaceport.

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* Zagro Spaceport *
*******************
01 - E
02 - IN
03 - HELP (the computer informs you of the commands you can enter)
04 - TYPE LIST PLANETS
05 - TYPE AKROL
06 - E
07 - E
08 - N
(There is a bug at this point. You are supposed to type SAY JEKRA, and Jekra will tell you that he needs covalium, but the Amstrad CPC version does not understand this command.)
09 - S
10 - W
11 - W
12 - TELEPORT (back to the Spacecruiser)
13 - E
14 - N
15 - TYPE GRAFLON

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* Graflon *
***********
16 - S
17 - S
18 - EXAMINE WATERFALL (there is a space behind it)
19 - S
20 - GET COVALIUM
21 - TELEPORT
22 - E
23 - N
24 - TYPE AKROL

*********
* Akrol *
*********
25 - E
26 - E
27 - N
28 - DROP COVALIUM (Jekra takes it and gives you a map of the Wastelands)
29 - S
30 - W
31 - W
32 - TELEPORT
33 - E
34 - N
35 - TYPE SEPTULE

***********
* Septule *
***********
36 - D
37 - S
38 - E
39 - N
40 - GET CARD
41 - TELEPORT
42 - E
43 - N
44 - TYPE ZAGRO

*********
* Zagro *
*********
45 - W
46 - W
47 - GET PROBE
48 - E
49 - S
50 - S
51 - S
52 - E (into the Wastelands; you have the map, so you can locate the metal dome where the crystal is located)
53 - S
54 - INSERT CARD
55 - TYPE (the computer informs you that the electric floor is activated)
56 - TYPE DEACTIVATE (the floor is now deactivated)
57 - OPEN DOOR (with the laser probe)
58 - E
59 - GET CRYSTAL