Mr. Timan

I know how to get the happy ending! In Level 4, the code 1349 is written in blood. Remember that. Then, at the end of Level 10, climb the ladder, walk over to the machine, and enter the code from Level 4. Then go down to the red button. And that’s it—you’ll get the happy ending!

It's a good puzzle game—it stutters a bit, but it's still good :)