Story: Under certain radiation exposure this artifact opens a portal. Presumably the portal will lead to another artifact in the parallel world. Mission: Enter the portal and find the artifact in the parallel world. You will receive our new development, a suit that will allow you to safely get through the portal, and theoretically protect you from possible dangers in the parallel world. Once you have found the artifact, press this button on your suit and you will get teleported back to the Black Mesa laboratory.
Full version of Half-Life: Before modification. [With Music & HD models] Version 1.1 changelog: - All music replaced with new one. - New voice for scientist. - New menu background. - Some new textures.