Cursor*10 2nd Session

[Mistery]

(puzzle)
This is the sequel to Cursor*10. Once again your goal is to reach the 16th floor within the time limit. Good luck!

Play Here

Please use spoilers to give hints:
[spoiler=Title Here]Enter text here...[/spoiler]

[brainisdead]

no clue how high i keep getting. i can get about 3 or 4 floors above the locked box.

(edit:- floor 12 and no clue how to solve it or get more time)

[Pikman46]

stuck on 12 also

[l-jr]

It's necessary constantly 'bombarding' middle square using squares with arrows.