Cubisum
Rate itTap boxes to raise their neighbours' numbers until your grid matches the target.
on cubisum.com
Cubisum is a daily number puzzle played on two grids side by side. Tapping a box on your grid adds one to each of its neighbours, and the goal is to make your grid show the same numbers as the target grid. Each day brings an Easy, a Medium and a Hard board, with a leaderboard, streaks and multiplayer races.
About Cubisum
Cubisum is a browser logic game built on one action. You play on the left grid while the right grid shows the numbers you need to reach. Clicking or tapping a box adds one to each box next to it; a right click or long press takes one away. A box can be clicked up to four times before it cycles back, and dots in its corner and its shade of blue show how many times you have used it. You win when every box on your grid matches the target.
The daily boards are generated from the date with a seeded random generator, in Easy, Medium and Hard, so everyone on the same date gets the same boards. The game says there is a new Cubisum every day at 5 PM your time, and a countdown shows when the next one arrives. An optional timer and number dots can be switched on in the settings, and the result screen gives your time and move count to share, with a statistics panel for wins and streaks.
Besides the daily Classic puzzle there is Public Multiplayer, where you race players from around the world, and Play with Friends, a private room you share with a game code. A Play More button gives extra boards once you have finished the daily one. The trick is less in the adding than in working out which boxes to press, since every press changes several numbers at once. It suits players who like short number puzzles in the family of Lights Out.
How to play Cubisum
- Choose a difficulty: Easy, Medium or Hard.
- Compare your grid on the left with the target grid on the right.
- Click or tap a box to add one to each of its neighbours; right click or long press to take one away.
- Watch the dots on each box: a box can be used up to four times before it resets.
- Keep adjusting until every number on your grid matches the target, then share your time and moves.
Screenshots
Tips
- Work out which boxes touch a stubborn target number before clicking; every click changes several numbers at once.
- Turn on number dots in settings so you can see how often each box has been clicked.
- Undo a move with a right click or long press instead of resetting the whole board.
- Start on Easy to learn how neighbours interact, then move to Hard.
Questions
Is it the same puzzle for everyone?
Yes. The daily boards are generated from the date, so everyone on the same date gets the same puzzles.
When is there a new puzzle?
The game says a new Cubisum appears every day at 5 PM your local time, and a countdown on the result screen shows how long is left.
Can I play against other people?
Yes, in Public Multiplayer or in a private game with friends using a game code.
Ratings and reviews
Games like Cubisum
GlowGrid
Another daily grid where each tap also changes the tiles around it, here lights on a 5 by 5 glass grid.
Diminoes
A daily take on Lights Out: pieces dropped on a 5x5 grid toggle lights until all are off.
Diffinity
A daily number grid solved from how neighbouring cells relate, filling 1 to 6 by their differences.
Fill Gates
Flip switches in as few moves as you can to reach a target output, the same press-and-check feel.
0h n0
A daily number-logic grid with short rules, where each number counts what it can see.
Daily Kakuro
A daily number grid where every run has to add up to its clue.
Cross Math
Fill a crossword-shaped grid of equations so every row and column works out.
Dozenal
Chain number tiles across the gaps so every chain works out to 12.