Halo: Combat Evolvedforever changed gaming when it launched alongside the original Xbox, proving PC quality first-person shooters could make their way to home consoles. Other popular examples of the genre existed before then on the N64 and PlayStation, likeGoldeneyeandMedal of Honor, butHaloestablished and perfected the dual-analog control format.

Related:10 Crazy Pieces Of Cut Content From Halo: Combat Evolved

Since then, first-person shooters have been a genre, though they have changed and evolved in many ways. While the core gameplay remains in tact, other aspects of the genre were either impossible back in 2001 or ridiculous ideas no one would ever think to implement in a first-person shooter.

10Focus On Online Multiplayer

Many forget the debut entry in the franchise lackedonline multiplayer. Shortly after Xbox Live Launched, online multiplayer started to become more popular and a bigger focus for developers. By the time the PS3 and Xbox 360 rolled around, many games even prioritized it over the single-player campaigns. While many quality single-player stories still exist in FPS games, a large chunk of fans completely ignore them, going straight for the multiplayer suite.

9RPG Elements

While certain PC FPS games included RPG elements beforeHalo, likeSystem Shock 2andDeus Ex,they were largely exceptions to the rule. Starting the with the PS3 and Xbox 360 generation, more and more games started adding skill trees and other ways to upgrade a character during the course of a campaign. This extends to the multiplayer suite as well, with games likeCall of Duty: Modern Warfarepopularizing the use of levels to unlock gear and equipment.

8Military Shooters

While wartime shooters existed side by side withHalo, many FPS games told science fiction stories. Games likeHalf-Life,Doom 3, andRed Factionall dealt with either space or futuristic technology. This focus changed dramatically around 2007 with the rise in popularity ofCall of Duty.Stepping into the shoes of a soldier in a war zone somewhere on earth was suddenly more appealing than traveling through space. The shift felt as dramatic as Hollywood abandoning the Wild West for space in the 1960s.

7VR

Older gamers will recall when VR was a pipe dream; something so easy to imagine, yet impossible to believe it would ever come true. Fortunately, technology does magical things and VR gaming is a tangible reality.

Related:10 Top-Selling VR Games (According To Steam)

It is still costly, but titles likeHalf-Life: AlyxandResident Evil 7have more than proven VR’s ability to deliver incredible gaming experiences. Hopefully the technology will be more readily accessible as the years go by.

6Cross-Play

Console wars were hot as the sun twenty years ago. PlayStation 2 owners used sales numbers to prove dominance while Xbox fans showed how every third-party game looked better on their console to show its superiority. While Sony and Microsoft are still competitors, most games allow players to interact with each other regardless of the platform on which they are playing. Many games even let PC players jump into the mix, making for a giant community.

5Aiming Down The Sights

Many games had an aiming button even duringHalo’stime, but players did not need to use it to fire accurately. With the rise of military shooters also came the normalization of aiming down the sights every time the player shoots. Without doing this, many guns will fire with wild inaccuracy. While still a popular mechanic, more games have started shying away from it, with titles like theDoomandWolfensteinreboots retaining a more old school feel.

4No More PC Exclusives

Back inHalo’sday many games were still coming exclusively to the PC, taking advantage of the more powerful hardware to make exquisitely gorgeous titles console did not have a hope of running. If they did, they were often half-baked ports with numerous technical issues, likeHalf-Life 2on the original Xbox. In more recent years, PC exclusive FPS games are few and far between. Those that are usually find their way to consoles eventually, or are else still in early access. One should still remember, however, that high-powered PCs still make these games look better than they do on consoles.

3Battle Passes

With online multiplayer becoming such a popular feature in games, developers and publishers had to find ways to monetize it. Purchasable maps split the player base up too much, which is unhealthy for the community, and loot boxes aretoo controversial, so the Battle Pass was introduced to split the difference. They provide bonus goodies for a price and an incentive to keep playing, since players still have to level up through ranks to unlock the new items.

2Battle Royale

Similar to VR, it was difficult to see giant matches where a hundred players duke it out as a possibility twenty years ago. However, now almost every franchise and genre has its own version of a battle royale.

Related:10 Ways Battle Royales Have Changed The Gaming Industry

While early battle royales likeFortniteandPUBGwere not first-person shooters,Apex LegendsandWarzoneproved the genre was a perfect fit for the large-scale battles.

1Free-To-Play

Imagine telling people in 2001 just how many big-budget games would be completely free to enjoy in the future. It would seem too good to be true. To be fair, it is in some respects. Some games find sneaky ways to encourage players to purchase goodies through microtransactions, while others are a little fairer. It is hard to blame all of them. These are free games after all, and they need some way to make money. It only becomes a problem when it feels exploitative to those vulnerable to gambling or impulse purchases.

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