Hardcore Combat Only

The entire gameplay consists of fighting enemies in different areas, and trying to reach end-game bosses, without ever touching any of the non-combat skills, or ever dying.

There's also a Google Sheets with highscores and some number crunching made by the community of the various players who play this gamemode. Hit mazunki [they/them]#3247 up on Discord if you wanna join or view it. Similarly, 8992#7954 has made a completion log script to hide unavailable items, which you can find at GreasyFork.

There is a guide for this gamemode available at HCCO/Guide.

Differences

Since we're playing Hardcore, there are some important parts to keep in mind:

No natural HP regeneration/s.
We start with 12 bank slots, capped to 80 (+ slots gained from Bank Slot Tokens after hitting 80 cap)
Harder penalties for being on the weak corner of Combat Triangle.
Permanent death

To regain

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Hitpoints

, our choices are very limited:

Consuming food, gained from monster loot:
- Potatoes from Plant
- Salmon, Lobster, and Shark from Sweaty Monster, Wet Monster, and Moist Monster
- Trout from Raging Horned Elite
Ancient Sword with its 25% chance for Life Leech (25% healing from damage dealt)
Warlock Amulet with its 20% healing from damage done from spells.
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Slayer Shop

Known alternatives and history

Note: This may not 100% accurate, and should be revised.

While HCCO is believed to having been created by CoolRox, they never played this game mode themselves. From the recorded history, it is not entirely known who was the first player who took this challenge seriously, although it's possible it was bad_name_2009#6633. Regardless, some honorable mentions are 8992#7954, JHawk55#8345, Nomeru#4261 who all played a non-official hardcore version of this gamemode (where regen applied).

After Hardcore was introduced, the only way to actually start a character in this game mode was by doing one of two things:

Spam Lemonade from the Easter egg
Fight the Confused Pirate, and flee before they hit you (since they have a slower attack than the player).

After seeing that HCCO was feasibly possible, some player figured out "Why not play it with no extra bank slots, instead?", and created what eventually became a trend amongst the challenger-community. There are a few noteworthy players including IzzyYSN#0220, and Hashtronomy#9283.