"Never Ending Level Game 19" – Need More Context to Identify

I can't identify a game by that exact title. It could be:

• A specific level 19 in an endless runner (Temple Run, Subway Surfers, Crossy Road).
• A puzzle game with "Level 19" notorious for difficulty (e.g., Brain Out, Monument Valley, The Witness).
• A Flash/HTML5 game named "Never Ending Level" (many exist on Coolmath, Kongregate).
• A custom Roblox / Fortnite Creative / Mario Maker 2 level.

To Help, Tell Me:

1. Platform: Mobile, PC, Console, Browser?
2. Genre: Runner, Puzzle, Platformer, Rhythm, Text?
3. Visuals: 2D pixel, 3D low-poly, vector, realistic?
4. Core Mechanic: What do you do? (Jump, swipe, type, think?)

With any detail, I can pinpoint the game or the level 19 solution.