Infinite Math vs Solki

That “I solved it!” feeling, all over again. A math app for grown-ups who solve for pleasure—not for any exam. From the wonder of primes and divisors to the crane-and-turtle puzzle, the Monty Hall problem, and even the legendary entrance exams of Japan's top universities— a collection of beautiful problems that make you feel "numbers are fascinating." ■ Made for you if you ・love numbers and logic puzzles ・enjoy giving your mind a workout in spare moments ・want to know not just the answer, but the idea behind it ・are done with exams, but want to rediscover the joy of math ■ Six categories, 80+ problems (more added over time) ・Number Theory & Puzzles … primes, divisors, Fibonacci, perfect numbers, and more ・Classic Problems … crane-and-turtle, Monty Hall, the Königsberg bridges, Pick's theorem, and more ・Elementary Exams … ferris-wheel logic, seesaw puzzles, and other gems ・Junior-High Exams … work, travel, concentration, and counting problems ・High-School Exams … symmetric expressions, probability, Euler's prime-generating formula ・University Exams … legendary stumpers like "Is tan 1° rational?" and "Prove π > 3.05" ■ Highlights ・Daily Problem … one fresh problem to tackle each day ・Sessions … test yourself with five problems at a time ・Explanations worth reading … not just the answer, but the background and the thinking ・Interactive figures … trace the Königsberg bridges or Pick's theorem with your finger ・Progress tracking … solved problems are recorded; aim to clear them all ・19 languages … enjoy these problems in Japanese, English, Chinese, Korean, and more Answers are simple multiple choice—and some figures come alive at your fingertips. Enjoy the world of numbers on your commute, on a break, or before bed.

Solki turns three flat shadows into one solid shape - and your child is the one who builds it. Three cards sit at the top of the screen: what the shape looks like from the front, from the side, and from above. The workbench below is empty. Tap a square, a cube drops onto it. Keep going until all three shadows match. No text. No typing. No reading required. WHAT YOUR CHILD LEARNS • Seeing in three dimensions - the skill behind maps, diagrams and drawing • Reading a plan and a side view, the way engineers and architects do • Holding two rules in mind at once, then three • Finding the cheapest answer, not just an answer THREE WORLDS, ONE WORKBENCH Shadow (ages 4-6) - one card. Copy what you see. Two Eyes (ages 6-7) - two cards, then three. Now the views argue with each other. Hollow (ages 8-10) - cubes float. Dozens of shapes cast the same three shadows; find the one that uses the fewest cubes. BUILT FOR SMALL HANDS Turn the workbench to see the hidden side. Every edge is colour-coded to its card, so nobody loses their bearings. Hold a cube to take it back. Nothing is ever lost, nothing is ever timed, and there is no way to fail. HOW WE MADE THE LEVELS Every level is solved by a program before it reaches your child. That program proves the puzzle is possible, and works out the fewest cubes it can be built with - that number is the three-star target. No level was guessed at, and no star threshold was typed in by hand. WHAT SOLKI WILL NEVER DO • No ads. Not now, not later. • No data collected. No analytics, no tracking, no accounts, no network code at all. • No permissions. Not the camera, microphone, location or notifications. • No subscription. One purchase unlocks every level, forever. • Works offline. Made by one person who wanted his own children to have something quiet to think with.