Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to play 100 floors [title] Launch 100 floors and tap on the green button to the right of the elevator. [step] This opens the elevator doors. [title] Tap on the green arrow located inside the elevator.

Ending1: [step] This will bring you to the elevator's underground floor. [title] Place or place a hand on the elevator door and guide the door that hangs up into the air away from you. Ending2: [step] Now you can choose what subfloor you will be playing on. [substeps] Alternatively, you can tap on any floor except the ceiling. Ending3: [step] After solving the puzzle on each level, the elevator doors will open to reveal the green arrow, which you must tap on to advance to the next level. [title] Look for clues on every floor to help you advance to the next level. Ending4: [step] You will enter 100 floors on the second floor. [title] Tap on the security checkpoint at the bottom of the elevator.

Answer format: ending1/ending2/ending3/ending4