Crossword puzzle clue "first video game with a selectable level of difficulty"

First video game with a selectable level of difficulty

Video game difficulty setting

Hardest difficulty level, often

Latin term for coming back to life at the exact midpoint of a video game level?

Video-game level

Network whose first video was "Video Killed the Radio Star"

Low-level pollution or high-level protection

Warning sign at a train station's food court? (NOTE: The original sign, without my additions, actually exists. It's in Grand Central Terminal in NYC, on the lower level — the food court level. The sig