Gridoku: Shikaku Logic Puzzle

Gridoku is a Shikaku puzzle: draw rectangles sized by the numbers and divide the whole grid with no gaps.
A classic Japanese logic puzzle, a fresh board every day, and a worldwide leaderboard.

■ Three rules
· Drag to draw a rectangle.
· Each rectangle holds exactly one number, and its area (cell count) must equal that number.
· Fill every cell and the board clears itself.

Ten seconds to learn, hours to put down. No math beyond counting cells — just numbers, rectangles, and logic.

■ Daily puzzle · Global ranking
· Every midnight the whole world gets the same board. One round a day keeps your streak alive.
· Clear it and see your rank on the spot: today's top 100, all-time fastest solves, your top-% and whoever just passed you.
· Pick a nickname and you're in — no account, no sign-in.
· Stamp the daily calendar, chase a perfect month, and earn bonus hints at streak milestones (3, 7, 14, 30 days and beyond).

■ Campaign · Endless
· Campaign: 5 chapters, 50 stages. Start at 5×5 and grow to 12×12.
· Endless: boards keep growing as you level up — up to 12×12, 144 cells.
· Hall of Fame: best clear time for every level and your longest streak.

■ Calm by design
· One drag draws, one tap erases. Portrait, one-handed.
· Warm paper-and-ink minimalism — each piece tints as the board comes together.
· Gentle haptics and soft background music, both switchable in Settings.
· Stuck? Spend hints earned from daily clears, or top up with a short ad.
· Puzzles work offline (only ranking needs a connection) and progress saves automatically.
· English and Korean.

■ Made for
· Fans of Sudoku, Nonograms (picture cross), Killer Sudoku and other number logic puzzles
· Five quiet minutes on the commute, at lunch, or before sleep
· Anyone building a daily brain-training habit
· Players who want to race the world on the very same puzzle

Shikaku, Rectangles, Number Area — many names, one satisfying idea. Today's puzzle is waiting.

Contact: siulabs.dev@gmail.com