Chasm

They later discover that a group of monsters known as the Timestrikers are using the power to create ruptures in time that allow them to invade the Earth in three different time periods: present day, ancient Egypt, and medieval times.

Timestrikers that have invaded the present day are also taking control of a nuclear plant in order to detonate a nuke that will destroy nearly all life on Earth.

The game starts in the present day, as the player goes inside the power plant and nuclear plant, battling strange-looking security guards and security systems that have gone haywire.

They will then find the rifts that the Timestrikers are using to invade other time periods, eventually winding up at the Timestrikers' military base in the distant future.

The 2022 Windows release is not a remaster but built up completely from the ground, using reverse engineering and by-sight recreation, as the original source code is lost.

In addition it includes a custom tailored DOSBox port of the original game.

This release also incorporates the official add-on originally released as a patch on the developer's website.

The add-on can be played both in the new version and the DOSBox version.

Chasm for PlayStation 4 is currently worth €43.59 loose, €30.26 complete in box, and €28.78 factory sealed. Prices are based on real sales and update regularly on Gamevaro.

Chasm has a steady sales history on the tracked marketplaces, meaning it trades hands regularly and isn't considered particularly rare.

Loose means cartridge or disc only, CIB (complete in box) includes the original box and manual, and sealed means factory-sealed and never opened. For Chasm, loose is €43.59 and CIB is €30.26 — CIB commands a premium because original boxes and manuals are fragile and often don't survive.