- add game "Chain Reaction"

Prompt:
```
Task:
Use 30% of your available tokens to think about a very fun game idea that can be implemented in a standalone HTML page (using JS libraries and modern css) without any backend-capabilities.

After you've tossed around some ideas, pick the one you are most confident in that it will actually be fun to play and implement it.

Requirements:
* Don't overengineer.  Add smart, simple and straightforward features. If you realize you've overengineered, take a step back and try another approach.
* The game should stay in the scope of this single HTML page.
* Provide the code with a minimal amount of line breaks and indentations in order to save tokens.
* Implement modern, well-structured and fitting design, UI and UX.
* Take your time thinking and planning. Don't provide the finalized code before creating a watertight plan.
* Modern JS, HTML and CSS only.
* You are allowed/advised to use external libraries via CDN.
* If you want to add sounds, use the AudioContext.
```

Author: TobiasMue91