SCP - Containment Breach is a free survival horror game written in Blitz3D.
The events of the game take place in a containment site of The SCP Foundation, a secret organization dedicated to containing and researching anomalous artifacts and entities that threaten the normality of the world. You're thrown into the boots of a Class D test subject, one of the Foundation's disposable human guinea pigs.
Not long after receiving your first assignment, the facility undergoes a massive containment breach, leaving you alone in the darkness with the escaped entities roaming around the facility.
Your goal is to make it out alive. You can also search the facility for documents and other clues to figure out what led to the breach, and even attempt to do your part in fixing the situation.
The main antagonist of the game is SCP-173, an animate concrete sculpture that kills all living things on sight, moving toward its victims at a speed of several feet in one blink of an eye and snapping their necks with irresistible strength and lethal precision. Fortunately, SCP–173 has one key weakness: it is frozen in place as long as someone is looking at it.
To make things more interesting, SCP - Containment Breach has a blinking mechanic that forces the character to blink regularly (which often has fatal consequences in the vicinity of SCP-173).
One of the key elements of the game is the procedurally generated map - no playthrough is the same, and you can never know for sure what is going to happen next. There are plenty of obstacles to make the way out of the facility less pleasant. Decontamination gas that makes you blink faster, locked doors that require a key card with a sufficient security clearance or a specific access code to open, timer switch controlled doors, and of course, several escaped SCPs.