Martian Affairs for the ZX81

Came also out for:
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Game description:
The player takes the role of an adventurer. Well, actually he is the only assistant of the professor and has to kill Smaug and retrieve the Arkenstone.
The player, Smaug and other nasties have been transported to Mars. Now the player is in a bunch of tunnels and caverns and, as mentioned above, has to take back the Arkenstone.
Luckily, there is a magic ring somewhere in the first level and finding it makes the player invisible against certain foes.
On Mars are also aliens who will not kill the player immediately but the player has to guess a number between 1 to 5 and guessing wrong three times will get the player killed by the aliens.
As for the creatures that were teleported alongside the player and Smaug are:
Trolls, who will ask the player for an amount of gold and of course, not having that amount will kill the player. Can be avoided with the magic ring.
Snakes, who are in a pit and it is randomly decided if the player will survive crossing their pit or falling in for a nice..."blood donor".
The Balrog: Kills the player immediately. Can be avoided with the magic ring.
Goblins: Try to catch the player. Just like with snakes, it depends on luck if they do. If they do the player is thrown into a lava.

[@Highretrogamelord]

Unfortunately, the game froze...