Coolant

A daily thermometers logic puzzle.

Loading your friend’s challenge…

Coolant

Today's loop is on its way.

Today's loop

Time 0:00

Row 1, column 1Row 1, column 2Row 1, column 3Row 1, column 4Row 1, column 5Row 1, column 6Row 1, column 7Row 1, column 8Row 1, column 9Row 1, column 10Row 1 count Row 2, column 1Row 2, column 2Row 2, column 3Row 2, column 4Row 2, column 5Row 2, column 6Row 2, column 7Row 2, column 8Row 2, column 9Row 2, column 10Row 2 count Row 3, column 1Row 3, column 2Row 3, column 3Row 3, column 4Row 3, column 5Row 3, column 6Row 3, column 7Row 3, column 8Row 3, column 9Row 3, column 10Row 3 count Row 4, column 1Row 4, column 2Row 4, column 3Row 4, column 4Row 4, column 5Row 4, column 6Row 4, column 7Row 4, column 8Row 4, column 9Row 4, column 10Row 4 count Row 5, column 1Row 5, column 2Row 5, column 3Row 5, column 4Row 5, column 5Row 5, column 6Row 5, column 7Row 5, column 8Row 5, column 9Row 5, column 10Row 5 count Row 6, column 1Row 6, column 2Row 6, column 3Row 6, column 4Row 6, column 5Row 6, column 6Row 6, column 7Row 6, column 8Row 6, column 9Row 6, column 10Row 6 count Row 7, column 1Row 7, column 2Row 7, column 3Row 7, column 4Row 7, column 5Row 7, column 6Row 7, column 7Row 7, column 8Row 7, column 9Row 7, column 10Row 7 count Row 8, column 1Row 8, column 2Row 8, column 3Row 8, column 4Row 8, column 5Row 8, column 6Row 8, column 7Row 8, column 8Row 8, column 9Row 8, column 10Row 8 count Row 9, column 1Row 9, column 2Row 9, column 3Row 9, column 4Row 9, column 5Row 9, column 6Row 9, column 7Row 9, column 8Row 9, column 9Row 9, column 10Row 9 count Row 10, column 1Row 10, column 2Row 10, column 3Row 10, column 4Row 10, column 5Row 10, column 6Row 10, column 7Row 10, column 8Row 10, column 9Row 10, column 10Row 10 count Column 1 count Column 2 count Column 3 count Column 4 count Column 5 count Column 6 count Column 7 count Column 8 count Column 9 count Column 10 count

Fill Empty

Undo Clear all Hint

Check Give up

• Bulb: coolant starts here
• Filled: coolant in the tube
• · Empty: your note, stays dry
• ! Red: a gap in a tube, or a count broken

Tap a cell to cycle open, filled, empty; or pick a brush and drag. Keys: arrows move, Space fills, Backspace empties, Delete opens, Enter checks, U undo.

Warm-up 6×6 Practice loop

Tap a cell to cycle it between open, filled and empty.

Prime the loop to file your time.

Next fill at midnight UTC.

How everyone did today appears here once 20 players have finished.

0Played

0Primed

0Win %

0Streak

0Best streak

0No hint

Best times: none yet.

Archive: Today's loop

Share result Copy challenge link Download PNG

Square (Discord) 1080×1080Phone story 1080×1920Share card 1200×630

Today's card shows the loop with its counts and given cells only, your time band, streak and the days to launch; a card for an earlier day shows that day's fill. Never today's fill.

Fill every tube from its bulb, never with a gap, so that each row and column holds its count. 10×10 on weekdays, the 12×12 full loop at the weekend, a 6×6 warm-up, brushes and drag-paint, live rule checks, one hint, a streak, personal bests and a spoiler-free result to share. A fan puzzle about an imagined cooling loop, never a status signal.

How to play

The loop is a grid tiled with straight thermometers. Fill every thermometer from its bulb towards its tip, with no gap, so that every row and column holds exactly its count. Tap a cell to cycle it, or pick a brush and drag; a count turns green when met and red when over or out of reach, a cell turns red when coolant sits beyond a gap, and the checks only ever look at the rules, never at the answer. Undo and Clear all are there when a tube goes wrong. Every loop is checked when the site is built by a solver that sets each thermometer's level in turn under the same rules you use (the given cells, count saturation, reach), so each has exactly one answer and opens with at least one cell the rules force; the 6×6 warm-ups fall to the rules alone, with no guessing at all.

Tip one: a count of 0 drains its whole line, and a line that already holds its count is empty everywhere else. An empty cell drains everything beyond it towards the tip, so one zero often empties several tubes at once; a line whose open cells are exactly what it still needs is all filled. Tip two: a filled cell fills its tube back to the bulb. So before you fill a cell, count what that drags with it: if the cells it would fill push a row or column over its number, that cell is empty; and if leaving a cell empty would drain a tube and leave a line short, that cell is filled. Then let the counts do the work: a line that still needs cells but has only one tube with room must fill that tube.

Everyone gets the same loop on the same UTC day: 10×10 on weekdays, the 12×12 full loop at the weekend, and newcomers can switch on the 6×6 warm-up, which still counts. One hint a day marks one cell the rules force, says which rule, and marks the result as assisted. When the last count turns green the tubes light from their bulbs, the chiller wakes and the ops lead signs off with your time; Give up shows the fill and ends the day without a prime. The archive lets you play any earlier day's loop and practice loops come from a spare pool; both are marked and never count. Coolant is a fan puzzle about an imagined cooling loop: nothing here is a server, a status figure or an asset from GTA 6, the tubes are abstract shapes and never a logo, nothing comes from a leak, and nothing is presented as official. For more deduction try the Cold Start, the Load Order and the Fault Finder.

Questions

What are the rules?

The loop is a grid tiled with straight thermometers: each has a round bulb at one end, a tube, and a flat tip at the other. Coolant fills every thermometer from its bulb towards its tip with no gap, so a filled cell means every cell between it and the bulb is filled too, and an empty cell means everything beyond it towards the tip is empty. The number beside a row or under a column says how many filled cells it holds. A few cells may be given from the start. Fill the loop so every count is met. Every loop here has exactly one answer.

How do I mark a cell?

Tap a cell to cycle it: open, filled, empty, open. Or pick a brush (Fill or Empty) and every tap paints that; drag across cells to paint a run; tap the brush again to go back to cycling. On a keyboard the arrows move the cursor, Space fills a cell (again to open it), Backspace marks it empty (again to open it), Delete opens, Enter checks, U undoes. Undo takes back the last change and Clear all empties the loop (the given cells stay). No soft keyboard ever opens.

What do the highlights mean?

A count turns green once its line holds exactly that many filled cells, and red when the line holds too many or the open cells left could never reach it. A cell turns red when coolant sits beyond an empty cell in the same tube. The checks only ever look at the rules, never at the answer. One hint a day marks one cell the named rules force, says which rule, and marks the result as assisted. Give up shows the fill and ends the day without a prime.

What is the warm-up?

A 6×6 loop for newcomers, switched on with the Warm-up toggle (remembered on this device). Every warm-up falls to the named rules alone, with no guessing. It counts as the day's solve; the 10×10 weekday and 12×12 weekend loops are what the best times are about.

Is this a real status signal?

No. Coolant is a fan logic puzzle about an imagined cooling loop in an imagined status room. Nothing here is a server, a temperature, a load figure or an asset from the game or its services, the tubes are abstract shapes and never a logo, nothing comes from a leak, and nothing is presented as official. For the real launch-day status picture, see the status page and the readiness guides on this site.

Load Balancer

Loop primed? Now balance the rack

A daily KenKen-style arithmetic logic puzzle: 6×6 on weekdays, the 7×7 full rack at the weekend, a 4×4 warm-up. A number pad, pencil marks, live rule checks, one hint, a streak, personal bests and a spoiler-free result to share. A fan puzzle, never a status signal.

Balance today's rack

Keep exploring

Daily games: 29 pages to explore

• Load BalancerA daily KenKen-style arithmetic logic puzzle. Fill the rack with 1 to N, no repeats in a row or column, so that every…New
• PlayEvery daily launch-prep game on GTA6 Is Down? in one place: the hype check, the question of the day, bingo, fact or…New
• Day-One Ready cardMake a poster that says you are ready for 19 November: pick your platform and your launch ritual, show how ready you…New