Decide the skill before you press play
Improvement collapses when the only goal is “beat my best.” A better ten-minute plan names one skill: cleaner jumps, fewer false starts, larger bubble groups, or a flatter Block Drop surface. Write it down if you need to. The round then has a job besides producing a number.
Choose a game that matches the skill. Reaction belongs to Reflex Rush or Whack Zones. Planning belongs to Block Merge or Lights Out. Timing belongs to Stack Tower or Basketball Shot. Mixing three games in ten minutes usually produces entertainment, not practice.
Use three short rounds, not one long spiral
Play two or three rounds with a pause between them. After each round, name the first decision that removed your options—not the final collision, which is often only the last symptom. Change one variable on the next attempt: look farther ahead, rotate less, or wait for cyan instead of guessing.
If you restart instantly while still annoyed, you are rehearsing the same error with more tension. The pause is the training. Ten seconds of review is more useful than thirty frantic retries.
Stop on the boundary you set
End the session when the ten minutes are up, even if the last round was a near-record. Chasing a prettier ending is how a break becomes avoidance. A complete practice session is one that you can leave. The personal best will still be in the browser tomorrow.
If the plan worked, you should be able to describe the habit you practiced in one sentence. If you cannot, the session was play—which is fine—just do not confuse it with practice. Both have a place; they should not steal each other’s time.