Fivefold vs Sumhow

Fivefold is a Sudoku-inspired game where the rules change every puzzle. Fill the grid through pure deduction, combining familiar number-placement logic with new rules. It's a game that will never stop giving you those satisfying "Aha!" moments. Enjoy the daily puzzle with your morning coffee, or play a quick, easy puzzle while you're waiting for an appointment. When you're ready, you can move to harder puzzles, like our large 7x7 puzzles that'll give your brain a real workout. We kept Fivefold simple. There are no ads interrupting you, no in-game currencies, and no tricks to keep you playing. The game comes with a ton of free puzzles, and if you want even more, you can buy a puzzle pack. That’s it! We made Fivefold because we love puzzles too. We hope it makes your brain work just a little bit harder, and we hope that you'll enjoy playing it as much as we enjoyed making it! - Matt & Owen

Somebody left you a calculator. Most of the keys are gone. Sumhow hands you a target and a handful of surviving keys, and asks you to make the number anyway. Three, plus and times are enough to get started. Then the machine starts changing the rules on you. HOW IT PLAYS • Every unit has a par: the fewest presses it can possibly be done in. Match it for three stars. • The machine resolves left to right, with no order of operations. On this unit, 3 + 4 × 2 is 14. • Undo and Clear are free, so experiment. There are no timers, no lives and no fail state. TEN CHAPTERS, ONE RULE EACH Roots, where √ only lands on whole numbers. Echo, where equals repeats the last operation. Decay, where the × key dies after two uses. Stutter, Memory, Wraparound, The Toll, Below Zero, Blind. And Word Mode: ninety-six trivia questions whose answers you spell by typing the number that reads as the word when the screen is upside down. The first four chapters are free. Each of the ten that follow is a single purchase, or earn it: every unit in a chapter at three stars pays for the next one in gold. HINTS THAT COST SOMETHING A nudge shows your next press. A route shows the whole solution. Both cost gold and cap the stars you can earn on that unit, so a hint is a choice, not a shortcut. SKINS Wear the calculator you want. Forty-three skins in seven packs, from leopard print to a synthwave sunset, tried on before you buy. THE QUIET PART The unit reacts to certain numbers. None of them are listed. Scratch mode is a fully working calculator with no target; that is where you go looking. Find enough and a chapter opens that is not for sale. No ads. No account. No energy meter. Just a calculator with a problem, and you.