Strip Poker Night at the Inventory

Y’all really need to learn to keep a poker face.

—Twisted Fate

Strip Poker Night at the Inventory (SPNATI for short) is a Rule 34 (and Rule 63 in one case) crossover fanmade browser game, named after Strip Poker and Poker Night At the Inventory (although it shares no overlapping characters and only some gameplay features with that series).

Made using a modified copy of Virtual Paper Doll creation program Minna no Kisekae 2 - formerly K-On! no Kisekae 2, and usually just called "Kisekae" (the generic term for such creators, meaning "dress-up") - a custom Windows application for writing dialogue, HTML5/JS and Git for collaboration. MIT/Expat licensed, which means that anyone can host their own copy, and a few sites do; the 'canonical' version lives here.

Tropes used in Strip Poker Night at the Inventory include:

And Your Reward Is Clothes: Characters can have collectibles, unlocked when a given condition happens in the game, resulting in an image and short description appearing in a trophy gallery. What those are varies, but quite a lot are souvenir clothes from the game.
April Fools' Day: Some characters only appear on this day, for reasons that become apparent if you play them (mostly excessive silliness).
Clothing Damage: Particularly in the case of Action Girls.
Go-Karting with Bowser: Referenced by name.
Loads and Loads of Characters: 200 in the main roster alone. See the subpage.
The Magic Poker Equation: Averted. Though different characters have different skill levels at different times, all hands are fair (except on April 1st).
Porn with Plot: Zig-Zagged. Although the premise of the PNATI games has been lightly adopted, characters vary in how much they stick to it, or any other personal or interpersonal 'lore'.
Recut: Parodied in the title of Nami's epilogue, due to the extensive duration compared to other epilogues.
Reign of Terror: Invoked by Bowsette.
Wall of Blather: Used by the more loquacious characters (N, Hermione, etc.) occasionally. Usually way overdone to convey that it's intentional and not just a webpage layout error.