Sometimes computer game may contain main part and several extra things/possibilities for player. So there is a difference between "I've finished that game" and "I've completely cleared/beat that game". Second one implies that you have finished all extra quests, gathered all items etc (depends on game). I know 2 such expression:
- Completely cleared/beat game. As explained above, to say this you should complete all quests, collect all items, get all gold medals etc.
- 1CC (one-credit-clear). That means you have finished game without continuing at all (or using just one live).
In Russian "пройти игру" и "полностью пройти игру" still stands for simple completing of the game. Is there any short expression analogue for complete game clearing?