Play "Sound Recall" to test your memory as you play back what the computer plays on five colourful keys. On Normal mode, the computer will visually show you which keys were pressed, and all you have to do is to correctly replay the sequence played by the computer.
For those who like a harder challenge, a Hardcore mode is also available. The computer will not show which keys were pressed this time, but instead, you must listen for the correct pitch that was played, and then play it back.
A Keyboard mode is also made available for some button mashing, however, please kindly keep in mind that this app is not an instrument app, so it is limited to only 5 keys: C, D, E, F and G.