延
extend · prolong · postpone · lengthen
延 carries the felt sense of pulling something further — a deadline (延期), a distance (延長), a hand reaching out (手を延ばす). The mini-game above maps that meaning onto a rubber band you stretch with the cursor: pull, hold, release inside the safe zone. Eight clean stretches and the kanji is yours.
Common compounds: 延長 (enchō, extension), 延期 (enki, postponement), 延滞 (entai, delay).