-i-9 tests the players short-term memory. The game relies on some of the common elements of the classic memory game, but you will not find those otherwise typical goals there. Focused and quick saving is required to move to the next level. Numbers must be reactivated from short-term memory in the proper order under time pressure. Once the player reaches a next level, time and numbers will increase. -i-9 trains the player to move at lightning speed. The player is captivated by the rapid success of his/her own short-term memory.
The visual design is purposely not that spectacular but adequate; the developers disregarded a storyline, cutscenes and animations. A perfect case of less is more! Overall, 2 modes (easy and manic), 5 levels and more than 4 different number displays can be mastered. An absolute must for all puzzle fans to add to their collection!