The Hollow is one of those Netflix animated series that flew under the radar but has a perfect critic score for a reason—it's a smart, puzzle-box mystery that treats kids like they have brains. Three teens wake up in a strange room with no memories and have to figure out what's happening, which is basically catnip for kids who love escape rooms, video game logic, and figuring things out.
The gap between the 100% critic score and 74% audience score tells you something: this is clever and well-crafted, but it's not non-stop action. If your kid needs constant explosions, they might get antsy. But if they're the type who likes mysteries, puzzle games, or shows where paying attention actually matters, this could be a winner.
It's solidly safe for the age 7+ rating—animated adventure peril without gore or nightmare fuel. The real question is whether your specific kid has the patience for a mystery that unfolds slowly. Worth trying the first episode to see if it clicks.