The rules of the game are itself like a virus. Looks like everyone here played a slightly different variant. It mutated wildly across space and time.
After I learned two different rule sets from two different sources, I went on and invented my own version. It became an instant hit in our class for many years to come.
Basically:
1. the map is randomized, with some "islands" randomly drawn, separating the map into "land" and "water"; map size is the whole A5 sheet, which is around 30x40 I think
2. player has 10 moves per turn, moving on "water" cells counts as 2 moves
3. the objective is not to kill everything, but only the enemy starting unit ("the mothership")
4. we even added FFA multiplayer later, where each eliminated opponent nets you +2 moves per turn for the rest of the game, to promote aggression. The diplomacy was intense at times, with "vassal states" and coalitions formed against stronger players.
Oh the memories.