Failover
A daily binary logic puzzle: fill every rack slot with a Primary or a Backup node until the cluster balances.
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Failover
Today's rack is on its way.
Today's rack
Time 0:00
- Primary node (P)
- Backup node (B)
- Empty slot; a ring marks a given
Tap a slot to cycle it; long-press or right-click cycles back. Counters show Primary·Backup per line. Keys: arrows move, 1 or B Primary, 2 or A Backup, 0 empties, Space cycles, U undo.
Tap a slot to cycle it between empty, Primary and Backup.
Balance the rack to file your time.
Next rack at midnight UTC.
How everyone did today appears here once 20 players have finished.
0Solved
0No hint
0Streak
0Best streak
–Best 8×8
–Best 10×10
Today's card shows the rack with its given nodes only, your time band, streak and the days to launch; a card for an earlier day shows that day's balanced rack. Never today's answer.
8×8 on weekdays, 10×10 at the weekend, a 6×6 warm-up, live rule checks, one hint, a streak, personal bests and a spoiler-free result to share. A fan puzzle, not a status signal.
How to play
The rack is a square of slots and every slot needs a node: Primary (blue, P) or Backup (amber, B). No three of a kind in a row or column, every row and column half Primary and half Backup, and no two rows alike, nor any two columns. Tap a slot to cycle it (long-press or right-click to cycle back); a slot in a run of three and the counter of a line with too many of one kind or that copies another finished line turn red, and the checks only ever look at the rules, never at the answer. Undo and Clear are there when a line goes wrong. Every board is checked when the site is built by a solver that applies the same rules you do, then tries a slot both ways only when nothing follows, so each has exactly one answer; the 6×6 warm-ups fall to the rules alone, with no guessing at all.
Tip one: two of a kind force their neighbours. Two Primaries side by side mean the slots on either end of the pair must be Backup, because a third would make a run; and two of a kind with one empty slot between them force that slot to the other kind for the same reason. Scan every line for pairs and gaps first: they are the free moves. Tip two: once a line holds half of one kind, the rest is the other. On an 8×8 a row with four Primaries has every empty slot left as Backup; fill them, then check the pairs that just appeared. When a line is down to its last two empty slots and matches a finished line everywhere else, it must differ from that line in those two slots, which settles both.
Everyone gets the same rack on the same UTC day: 8×8 on weekdays, 10×10 at the weekend, and newcomers can switch on the 6×6 warm-up, which still counts. One hint a day fills one slot the rules force, says which rule, and marks the result as assisted. When the last slot balances the LEDs light up one after another, the frame goes green and the ops desk signs off with your time. The archive lets you play any earlier day's rack and practice racks come from a spare pool; both are marked and never count. Failover is a fan puzzle that borrows the words of a server rack: nothing on this page reads or reflects the state of any real service, nothing here is from GTA 6, and nothing is presented as official. For more rack puzzles try Rack Flip, the Signal Path and Packet Pipes.
Questions
What are the rules?
Every slot of the rack takes a Primary node (blue) or a Backup node (amber). No row or column may hold three of the same kind in a row, every row and every column holds as many Primary as Backup, and no two rows are alike, nor any two columns. Some slots are given and locked. Every board here has exactly one answer.
How do I fill a slot?
Tap a slot to cycle it: empty, Primary, Backup, empty. A long press (or a right click) cycles the other way. On a keyboard the arrows move the cursor, 1 or B sets Primary, 2 or A sets Backup, 0 or Backspace empties the slot, Space cycles, U undoes. Undo takes back the last change and Clear empties every slot you filled.
What do the highlights mean?
A red slot sits in a run of three of the same kind; a red counter marks a row or column with too many of one kind, or one that copies another finished line. The checks only ever look at the rules, never at the answer. One hint a day fills one slot the rules force, names the rule, and marks the result as assisted.
What is the warm-up?
A 6×6 rack 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 8×8 weekday and 10×10 weekend racks are what the best times are about.
Is this a status signal?
No. Failover is a fan logic puzzle that borrows the words of a server rack. Nothing on this page reads, reflects or predicts the state of any real service, and nothing here is from the game or presented as official. For the actual launch-day picture, see the status pages and guides on this site.
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