Sumplete Unlimited: Play the Number Logic Puzzle in Any Grid Size

Sumplete Unlimited is the free endless mode of Sumplete, the number logic puzzle where you delete numbers from a grid so that every row and column adds up to its target sum. Play unlimited puzzles in grid sizes from 3×3 to 9×9 with five difficulty levels — no login required. It's a fresh take on Sudoku-style puzzling that flips the core mechanic on its head: instead of filling numbers in, you cross them out.

What Is Sumplete?

Sumplete is a free daily number logic puzzle inspired by Sudoku, Kakuro, and Hitori. The premise is simple but surprisingly addictive:

1. You're given a grid completely filled with numbers.
2. Every row and column has a target sum shown on its edges.
3. Your job is to delete numbers until the numbers left in each row and column add up to exactly the target sum.
4. When a row or column reaches its correct total, its sum indicator lights up.
5. Light up every row and column, and you've solved the puzzle.

The game has three main modes: Daily 5×5, Daily 7×7, and Unlimited mode. The daily modes give everyone the same puzzle each day — a race against the clock — while Unlimited mode lets you play as many puzzles as you like at your own pace [1][2].

Sumplete has one of the best-documented origin stories in the daily-games scene. London-based programmer Daniel Tait asked ChatGPT to invent a Sudoku-like game that didn't exist; after several attempts the chatbot pitched "Sum Delete," then helped code a working HTML/JavaScript version in about 30 seconds and coined the portmanteau name "Sumplete." Tait bought sumplete.com and published it in March 2023 (TechSpot). A Gizmodo follow-up noted the game closely resembles older mobile titles like Summer and Rullo, so ChatGPT's claim of originality was shaky — but Sumplete's browser version is what made the format mainstream.

What Is Sumplete Unlimited?

Sumplete Unlimited is the free-play mode at sumplete.com/unlimited. Unlike the daily challenges, it has no limit on how many puzzles you can play, and it gives you full control over the difficulty:

• Grid sizes from 3×3 (beginner) to 9×9 (expert). A 3×3 Easy puzzle takes about 30 seconds; a 9×9 Master puzzle is a serious workout.
• Five difficulty levels: Easy, Medium, Hard, Expert, and Master.
• 100% free, no login needed. You can jump in and play immediately.
• Optional free accounts can track win streaks, solve times, leaderboards, and sync progress across devices [2].

If the daily puzzle leaves you wanting more — or you want to practice a specific grid size before the real thing — Unlimited mode is where you go.

Sumplete Unlimited vs Daily Mode: Key Differences

The Daily 5×5 is the "everyone solves the same grid" challenge — great for comparing times with friends. Unlimited mode is the training ground: try the 3×3 to learn the moves, then work your way up to the 9×9 monsters [1].

How to Play Sumplete: Step-by-Step

The controls are intuitive — each cell cycles through three states:

1. Tap once to delete a number (marked with a red cross).
2. Tap again to mark it as kept (green circle).
3. Tap a third time to reset the cell back to unknown.

This means mistakes are free. You can change your mind at any time, which makes Sumplete much more forgiving than pen-and-paper logic puzzles [5].

Solving Strategy: The Visual Guide Approach

Logic-puzzle site GridJoy breaks the game down into two ideas to hold:

• Kept numbers in a line must total its target. Cross out the rest.
• Rows and columns share cells. A number you keep for a row also counts toward its column — the two directions keep each other honest [3].

And here's the best opening move, which needs no adding at all: look for a number bigger than the target. In a row that must total 5, a sitting 6 can never be part of the answer — keeping it overshoots the target all by itself. Cross it out, free of charge [3].

From there, the deductions cascade: one crossing forces the next, and each row-and-column tag-team breaks the puzzle open. AARP's FAQ for the game gives the same advice — hunt the too-big numbers first, and remember that logical deduction matters more than speed or advanced math skills.

7 Tips for Sumplete Unlimited

1. Start with 3×3 Easy. It takes about 30 seconds and teaches you the core moves. From there, bump up to 4×4 or 5×5. If you can beat the Daily 5×5 without hints, you're ready for bigger grids [2].
2. Attack the smallest targets first. Clearing small sum clues first removes excess cells and makes the bigger clues easier to solve [1].
3. Delete the too-big numbers. Any number larger than its row or column target can never stay — these are free eliminations [3].
4. Spot the "must keep" cells. If crossing out a number would make the row's remaining total fall below the target, that number must stay [3].
5. Use columns to break row ties. When a row can't tell you which cell to cross, look down its columns — the other direction often answers the question [3].
6. Mark keeps explicitly. Using the green "keep" circle (rather than just leaving cells unknown) turns hidden assumptions into visible deductions.
7. Move up difficulty gradually. Hard grids change the feel of the puzzle; Master 9×9 demands real patience. The official site's hard mode guide covers the tactics that matter on bigger grids [1].

Sumplete vs Sudoku vs Kakuro: What's the Difference?

Sumplete shares Sudoku's grid-based structure, but the gameplay is reversed: instead of filling numbers in, you remove them. Like Kakuro it uses arithmetic, but the puzzle is flipped — every row and column has a target sum, and you delete numbers until what's left adds up [2].

Where to Play Sumplete Unlimited Free

The official game lives at sumplete.com — the Unlimited mode page (sumplete.com/unlimited) is the real deal: free, no login, grid sizes from 3×3 to 9×9. The daily challenges are on the same site.

Sumplete is also offered on game portals like AARP's games section, which carries its own FAQ for the game — a sign of how quickly it's become a mainstream casual puzzle [5].

Play Plusword Too

If you enjoy grid puzzles with a word-game twist, try Plusword — the daily crossword-style word puzzle. Learn how to play Plusword or see how it compares in our Plusword vs Wordle breakdown.

Sources

sumplete.com — official game and daily puzzles; sumplete.com/unlimited — free endless mode; GridJoy — strategy guide; AARP — game FAQ.