Stop before a run turns into a loss
Three signs attention is spent, and how to set the limit before you start.
Running games have no ending, so the decision to stop is always yours. The trouble is that the human brain does not handle endless games well. After one run that nearly broke a record, the wish to try once more grows stronger than the wish to stop, even when the hand is tired and the eyes are blurred.
The first reliable sign is a drop in decision quality, not in score. When you start jumping earlier than usual, or start jumping at the same obstacle you cleared calmly ten minutes ago, attention has fallen. The score may still climb because the game speed rises, but your decisions are no longer precise.
The second sign is a hand that begins adjusting to a new position. When you catch yourself shifting your grip, propping the phone on the table, or switching fingers, that is not an improvement. It is a sign the muscles are tired and looking for a way out. Runs after that change are almost always worse.
The third sign is the urge to try once more after a stupid loss. A stupid loss, meaning a death on the first easy obstacle, is the clearest signal that the session should end. When the brain is bored it stops watching, and running games do not forgive even a moment of absence.
The most effective way to stop is to set the limit before you begin. For example: three runs, or one improved record, or fifteen minutes, whichever comes first. When that limit is reached, close the tab even though you still want to play. That feeling of still wanting to play is exactly what brings you back tomorrow with fresh hands.
If stopping is hard, one small trick helps: after the last run, do not look at the scoreboard. Close the tab immediately. The scoreboard is where the wish to try again is born, and avoiding it for ten seconds is enough to break that chain.
Set a run budget before opening the tab, not after losing. For example: six runs or ten minutes, whichever comes first. A budget fixed in advance prevents decisions made while emotions are high, and decisions made while emotions are high almost always take the shape of one more unplanned run.
Watch for the earliest sign of fatigue, which is slower decisions rather than slower reflexes. Once you start thinking about an obstacle after it has passed, attention has already dropped. At that point a two-minute break is worth more than three extra runs, because restored attention produces better runs than forced attention.
Stopping after two losses in a row is better than pushing through to five. Consecutive losses mean the pattern you memorised no longer matches the speed of the game, and continuing adds frustration without adding skill. Close the tab, write down one thing you learned, and come back tomorrow with a calm hand.

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