Memory Game. A 4x4 and 6x6 memory game using visuals

Memory Game. A 4x4 and 6x6 memory game using "visuals" and "audio". User will remember the location visual and audio clues. In the audio mode, there is no graphic will be presented to the user. Audio files randomly are randomly scattered over grid, like visual mode. Player touches a cell and hear an audio, then memorize its location to find its pair. The game will have a countdown timer, and keeps best score permanently. Collection view API will be utilized. App has two levels of game, 4x4 and 6x6 grid. User selects game mode and game size. Audio/visual component is required, i.e., appropriate sound and appropriate  visual presentation.