My occasional references to Kingdom of Loathing seem to miss many, so this is your briefing. Kingdom of Loathing is a silly browser-based fantasy adventure game with a limited number of turns per day. It makes mocking or ironic use of the familiar computer RPG tropes, and most of the game text is humor-based. The graphics are stick figure-based. Over time, it has developed a loyal following, an active economy, and a sort of meta-game developed by/in cooperation with the community.
You pick one of six classes: melee (Seal Clubber, Turtle Tamer), ranged (Accordion Thief, Disco Bandit), or mage (Pastamancer, Sauceror). A Sauceror might protect himself with a Jalapeño Saucesphere and attack with a Saucegeyser, while a Seal Clubber uses Musk of the Moose Ox to find enemies to beat down with his Lunging Thrust-Smack. The three types of classes each lend themselves to different play strategies.
Your goal is to save King Ralph XI, who has been imprisoned by the Naughty Sorceress. Along the way, you level up by completing quests like killing rats at the Typical Tavern, making a Bitchin’ Meat Car, or helping the Deep Fat Friars. Once you save the king, you can hang about and mess with whatever you like (content keeps going), or you can Ascend and start over. Ascending lets you make one skill permanent, and you can get your stuff back (eventually) from Hagnk’s Ancestral Mini-Storage.
Along the way you will fight monsters like filthy hippies, chowder golems, vampire clams, zmobies and zobmies (at The Misspelled Cemetary), and spooky gravy fairy ninjas. You might stab/club them with the ridiculously huge sword, shoot them with a bubblewrap crossbow, or channel your pasta spell through a Gnollish slotted spoon.
It might be worth checking out the wiki for more silliness. You will want that link anyway, because it is probably not possible to reach and defeat the Naughty Sorceress without some spoilage.