Binary Drop

Yes. Binary Drop is free and runs right in your browser on desktop, so there is nothing to download or install. Open the page and you can start playing straight away.

Binary Drop is a desktop browser game, so a computer is the way to go. It's built for a landscape view, and you can play with your mouse and keyboard.

No. The gentle first level teaches everything by watching, so you pick up how the lights work as you go. Each column has its value shown above it, so you can always check.

Lime rows show a number, and you tap the lights so they add up to it. Violet rows come already lit: you add up the lit lights and type the total using the keypad or your keyboard.

Yes. Each level adds more lights and more speed. From level 3 the rows start falling like Tetris, so you have to think faster as well as add up correctly.

Partly. From level 3 the rows fall like Tetris, but you don't slot shapes together. Instead you set lights to match a number or add up lit lights, so it's more a maths puzzle than a stacking game.

On violet rows you can type with the on-screen keypad or your keyboard. The keys used are the digits, Backspace to fix a slip, and Enter to confirm your total.

That's the idea. You practise decimal-to-binary conversion on every row, using column values of 8, 4, 2 and 1, while streaks, rising melodies and confetti keep it feeling like play rather than study.