MemoryStack
Watch the cubes flash. Tap them back in order.
One more cube each round. Tap them in the same order they lit up. One wrong tap and the run is over — your score is the highest round you cleared.
About MemoryStack
MemoryStack is a sequential pattern memory game on a 3×3 grid of cubes (or 5×5 in Hardcore mode). Each round flashes one more cube than the last — round 1 lights up a single cube, round 2 lights up two, and so on — and you have to tap them back in the same order. One wrong tap ends the run. The score is the highest round you reproduced cleanly, so a run that gets to round 9 beats a run that got to round 7 every time. Each cube also plays a unique pentatonic note when it lights up, so even random sequences sound musical and the audio gives you a second memory channel. Free, no account, plays on any device.
How to play MemoryStack
Hit Start. The grid will say WATCH — pay attention. The first round lights up one cube briefly; once it goes dark, the label switches to YOUR TURN and you tap the same cube. The next round lights up two cubes in order; tap them in the same order. The sequence keeps growing by one each round. Tap the wrong cube and the run is over. The result screen shows the highest round you cleared and a verdict tier from Novice up to Mastermind.
Tips for longer runs
Use the audio. Each cube has a fixed pitch, and your ear can chunk a sequence into a melody much more reliably than your eyes can hold nine flashing positions. Around round 5 most people start to slip; the trick is to deliberately group the sequence in twos or threes ("top-left then bottom-middle... pause... right column...") instead of trying to memorise it as one long string. Don't rush the input phase — the game doesn't time you, only your accuracy matters.