Initializing, please wait a moment
How to Play Thirteen Case Files - Step by Step
The Thirteen Case Files page loads a ~10 KB detective puzzle in an iframe.
Step 1 - press Play
Press Play to inject the iframe (~10 KB). The 320x240 canvas boots with the case briefing screen.
Step 2 - open reports and files
Click or touch menu items on the canvas to read the police report and personal files for each suspect.
Step 3 - choose protect or arrest
Each day you may protect one potential victim from the killer or arrest one suspect you believe is guilty - only one action per day.
Step 4 - advance the investigation
Correct choices keep potential victims alive and narrow the case toward identifying the serial killer tied to the number 13.
| Setting | Value | Notes |
|---|---|---|
| Download | ~10 KB | single-file HTML + JS |
| Input | click / touch | 320x240 canvas |
| Saves | none | session-only |
| Core loop | report -> protect or arrest | detective choice puzzle |
See when to play, comparisons, and Rollermaze.
Why trust these tools
- Ten-plus years of web tooling. The freetoolonline editorial team has shipped browser-based utilities since 2015. The goal has never changed: get you to a working output fast, without an install.
- No install, no sign-up. Open a tool and get a working output in seconds - nothing to download and no account to create. Tools that need heavy processing run it on our service, so even a low-powered machine gets the job done.
- Analytics stops at the page view. We measure which pages get visited, not what you type or upload inside a tool. There is nothing to sign in to and no profile is attached to your input.
- Open-source core components. The processing engines underneath (libheif, libde265, pdf-lib, terser, clean-css, ffmpeg.wasm, and others) are public and audit-able. We link to each one in its tool page's footer.
- Free, with or without ads. All tools are fully functional without sign-up. The Disable Ads button in the header is always available if you need a distraction-free run.
Loading reviews...