Since I bought this game earlier this game earlier this year and Resurrected by the great people at Nightdive recently released, I would like to put in my 2 cents into the ring of option surroundeding this game. First off the good, I really like the premise and the fact you can freely explore the island and collect the keys in any order, is really neat for an fps released during the 90s, Killing Time is basically BioShock crossed with Doom, both progression and setting wise. Now for the bad, let's start with comparability, I mainly play my PC games in my Laptop which has windows 11 installed and let me tell you, DO NOT PLAY THIS GAME WITHOUT THE COMMUNITY PATCH! Not only you don't get mouse support, the games graphics get all out of whack with the weapon sprites being outside of the game and the world itself in a small box, so do yourself a favor and install the community patch, you can get it here, http://cubanraul.altervista.org/kt/index.htm Another set back is that sometimes it seems like your just wandering around and some of the puzzles are a bit obtuse. But since that the remaster is out now, buying this version could be considered a bad move because not only Nightdive have done an amazing job remastering this game, this version comes free if you buy it, so tldr, great game, bad compatibility(on windows 11 at least) without patches, buy Resurrected.