String Theory Game vs Japsum

String Theory is a colorful puzzle game about matching a given pattern by building it out of different colored shapes. String theory has 60+ handcrafted puzzles, daily challenges, and free play modes, making for hours of fun. Draw lines between pegs to create loops. The loops fill in with a different color depending on how many pegs they touch. Any loop that touches either three pegs or six pegs turns green. Any loop that touches either four pegs or eight pegs turns purple. Any loop that touches either five pegs or seven pegs turns spotted purple. Replicating the given pattern with as few loops as possible requires strategic placement and overlapping of loops. With dozens of handcrafted patterns to match, and thousands additional free play patterns, String Theory is a mind-bending game filled to the brim with tricky puzzles to get the gears turning! No ads, no microtransactions.

Japsum (short for "Japanese Sum") is a free, logic-based, combinatorial number-placement puzzle game. It’s similar to Kakuro or Sudoku puzzles, but with its own unique twist. Starting with an empty grid, you’ll use hints provided on the sides and top to place numbers or black boxes in the grid. The hints indicate the sums of consecutive numbers, with no black boxes in between. Multiple hints mean that sequences of numbers are divided by one or more black boxes. By using logical reasoning and interpreting these hints, you’ll make steady progress in filling in the grid with numbers and black boxes. Be prepared—especially with the larger grids, these puzzles can get very challenging! The app offers grid sizes ranging from 3x3 to 22x22—the largest puzzles of this kind, as far as I know. Every puzzle has exactly one unique solution, ensuring a fair and rewarding challenge. As you solve puzzles, your level increases, unlocking larger grids and fun bear avatars that you can choose to represent your progress. Best of all, Japsum is completely free—so you can dive into the world of Japanese Sum puzzles at no cost. Are you ready to test your logic and take on the ultimate puzzle challenge? Download Japsum today and start solving!