Hardcore Call of Duty Zombies players showed off impressive speed runs and even broke some records in their quest to compete in a $20,000 Zombies World Championship this month in Los Angeles.

Popular YouTuber Mcsportzhawk” teamed up with 1P Entertainment to put the championship together, and invited players to compete in online qualifiers in one of four Black Ops III Zombies challenges. All challenges were recorded, and you can watch the winners pull off some pretty incredible feats. The four finalists will be flown to Los Angeles to compete for the $20,000 prize pool on August 19. Here’s how the preliminaries went down.

Player “ImOverCharged” dominated the Origins First Room challenge by surviving for 60 rounds trapped in the starting room of the Origins map. First Room challenges are tricky because you’re limited to basic items within a tiny spawn area, meaning you’re left with trash guns and lacking the perks usually desired to achieve high rounds.

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Origins is probably one of the most interesting First Room challenge maps, because you can complete objectives to obtain items otherwise inaccessible while locked in the starting room, such as the Double Tap perk and an upgraded gun. 115 headshots will allow a player to obtain an upgraded gun from the mystery box, but whether that weapon is actually good is a matter of chance. Zombies also randomly drop Zombie Blood, which automatically disguises players as zombies for a short time to prevent being attacked.

Going for 60 rounds without decent guns or even the Juggernog health perk is completely insane, but ImOverCharged is no stranger to the First Room challenges. He currently holds three Zombies world records, including the Origins First Room challenge on Black Ops II.

For the Verruckt No-Jug challenge, no Gobblegums were allowed, and players had to survive as long as they could without the health boost provided by the Juggernog perk. Prior to ZWC, the world record for Verruckt No-Jug was only 46 rounds.

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Player “Mossy” earned his spot in Champs with a whopping 119 rounds survived. This was no easy task because zombies can sponge so many bullets and take you down fast in high rounds. Mossy used electric traps, strategic routes, and a whole lot of patience to beat out the competition, with his winning performance taking 57 hours. (Thankfully, you can hit pause and take a break on solo Zombies mode, but that’s still a lot of hours spent herding and electrocuting the undead.) Mossy currently holds 21 Zombies world records.

Player “KingKorbs” raced through the Revelations map, completing its complex Easter Egg speed run with a time of 40:23. To put this time in comparison, the 7th through 10th place finishers took an hour or longer to complete. KingKorbs made use of the “Anywhere But Here” Gobblegum, which lets you randomly teleport to another location. This, too, has a wild element of chance, since you can’t choose where you end up. KingKorbs holds 8 Zombies world records, 7 of which are Easter Egg speedruns.

The Gorod Krovi Easter Egg speed run offered the most intensely tight competition, but “Maitrash” squeezed in at first place with a time of 41:19, about one second faster than the 2nd place player. Maitrash also used Anywhere But Here to randomly teleport around the map, his second use of the Gobblegum fortuitiously teleporting him close to the next step in his Easter Egg sequence.

Maitrash holds two world records, is the only finalist under the age of 18, and will be flying all the way from France to compete in L.A. later this month.

In Los Angeles, each finalist will team up with a popular Zombies YouTuber to compete live for a share of the prize pool. Mcsportzhawk has also announced everyone who placed in the top ten for each of the four categories will get a free entry into next year’s Zombies World Championship.

S.E. Doster (@sedoster) is an author, artist, and competitive Call of Duty fanatic who enjoys quoting Buffy the Vampire Slayer.