Japsum vs Chainlink Puzzle

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!

Chainlink is a unique logic puzzle game that challenges your reasoning and pattern recognition skills. Solve over 4200 carefully designed puzzles, from beginner-friendly 4x4 grids to challenging 9x9 boards, plus special bonus levels for experienced players. Every puzzle has exactly one valid solution and can be solved using pure logic. Objective Fill the grid with numbers so that all rules are satisfied: • Each row contains every number exactly once. • Each column contains every number exactly once. • Each chain contains every number exactly once. Some numbers are already given. Use logic to complete the grid. Grid and Numbers • Board sizes range from 4x4 to 9x9. • In an N x N grid, you use the numbers 1 to N. • The position of numbers is not ordered - only the rules matter. Rows and Columns • Every row must contain all numbers from 1 to N. • Every column must contain all numbers from 1 to N. Chains • The grid is divided into chains - groups of connected cells. • Each chain contains exactly N cells. • In each chain, all numbers from 1 to N must appear once. • Chains can have any shape, as long as cells touch by edges. Given Numbers • Some cells are prefilled and cannot be changed. • These numbers serve as clues to help you solve the puzzle. Progress Start with smaller boards like 4x4 to learn the rules and patterns. As you advance, move on to 5x5, 6x6, and larger grids for a greater challenge. Features • 4200+ logic puzzles • Grid sizes from 4x4 to 9x9 • Bonus levels for advanced players • Day and night mode • Cell notes for tracking possibilities • Hints when you are stuck • Undo moves at any time • Highlighting of errors Train your logic, enjoy the chains, and have fun solving every puzzle in Chainlink.