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Mini-games for memory, focus, logic and math, plus Learn Math lessons with certificates. <b>Mental Calculation</b>: Follow expressions; each result is the base for the next. <b>Chain Calculation</b>: Solve a formula step by step. <b>Sherlock Calculation</b>: Reach the goal with the given numbers and operators. <b>Fraction Calculation</b>: Solve the fractions. <b>Value Comparison</b>: Pick the expression with the highest value. <b>Bubble Sum</b>: Add the numbers on the floating bubbles. <b>Quick Sum</b>: Numbers flash one at a time; enter the total. <b>Anomaly Puzzle</b>: Find the figure that stands out. <b>Pattern Sequence</b>: Work out the rule along each row and complete the grid. <b>Path Finder</b>: Follow the arrows from the marked start. <b>Visual Memory</b>: Memorize the shapes, then identify the hidden one. <b>Ghost Grid</b>: Watch tiles light up; tap them back in order. <b>Color Confusion</b>: Tap the ink color, not the color the word names. <b>Colored Shapes</b>: Add the points from the correct statements. <b>Orbit Tracker</b>: Track the highlighted balls as they move. <b>Flash Crowd</b>: Tap the side that flashed more dots. <b>Mini Sudoku</b>: Each row, column and block once per digit. <b>Mini Chess</b>: Finish the scenario as white against the CPU. <b>Solo Chess</b>: Capture until only the king remains. Every move must capture. <b>Mini Checkers</b>: Find the winning combination as black on a 6x6 board. <b>Lights Out</b>: Turn off every light; taps toggle neighbours. <b>Sliding Puzzle</b>: Slide tiles into order. <b>Shikaku</b>: Divide the grid into rectangles matching their numbers. <b>Nurikabe</b>: Paint the sea around numbered islands, no 2x2 blocks. <b>Cat Queens</b>: One cat per row, column and color zone; none may touch. <b>Knot</b>: Connect colored pairs without crossing; cover every cell. <b>Tower of Hanoi</b>: Move the stack to the right peg. <b>Schulte Table</b>: Tap the numbers in order as fast as you can. <b>Flags</b>: Name the country; one wrong answer ends the run. <b>Digit Memory</b>: Memorize digits, solve a quick sum, then recall. <b>Spot the New</b>: Tap the animal you have not seen before. <b>N-Back</b>: Tap Match when a shape repeats the one N steps back. <b>Wordle</b>: Guess the five-letter word in six tries. <b>Matchstick Riddles</b>: Move matchsticks to fix equations. <b>Peg Solitaire</b>: Jump pegs until one remains. <b>Sudoku</b>: Classic full-size Sudoku, several difficulties. <b>Chess</b>: Full chess vs the CPU or pass-and-play. <b>IQ Test</b>: 30 matrix puzzles in 15 minutes, with an estimated IQ. Just for fun. <b>Missing Operators</b>: Find the operators (+, -, *, /) that make the equation true. <b>Bulls & Cows</b>: Guess the secret 4-digit number. <b>Simon Says</b>: Tap the growing pad sequence back each round. <b>Prism Clear</b>: Swap matching tiles to clear lines; empty the board. <b>Trio</b>: Find three cards that share a shape, a fill or a count. <b>Mental Rotations</b>: Is the second block the first one turned, or mirrored? <b>Mental Flex</b>: A cue pair sets the rule; match the target on that trait. <b>Rule Shift</b>: Sort cards by a hidden rule that changes once you have it. <b>Reversi</b>: 6x6 vs the CPU or pass-and-play. Trap a line to flip it. <b>Checkers</b>: 8x8 vs the CPU on three levels or pass-and-play. Captures are compulsory. <b>Learn Math</b>: Lessons, tests and certificates in Arithmetic, Geometry, Measurement and Algebra. Every game has <b>medals</b>. Several <b>achievements</b>. No tracking. <b>Open source</b>.