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I've never used games as representational replacements for what would, in the narrative, be non-game skill rolls. I have, however, used games twice when the characters in question were actually playing said game as part of the plot.
The first time was when the PCs came across Death, who was curious about them and decided to check them out because they had just become Mythic (Death, in that setting, had a particular interest in mortals who started down that path). He offered them the chance to take one of four tests (or not, it was all completely optional). The Test of Intellect, the Test of Strength, the Test of Luck, and the Test of Deftness.
Anyway, long story short, the Test of Luck was playing a game of Liar's Dice with death, and for any PCs who picked that, we just plain played it out with the actual dice there. For all the challenges, if you won, Death granted you an extra point to your maximum possible Mythic Power reservoir. If you lost, he took one.
The second time was quite a bit later on, when the PCs were stuck in the depths of Limbo, without any way to Plane Shift out (since the only one who could cast it was an oracle NPC who had gotten separated from the party). So they visited a local denizen called the Player of Games, who had a large trove of magical items that he'd put up as the stakes in his games.
So they, along with a bunch of other people who had gotten sucked into that place, went to the portal to his pocket realm. He welcomed them in, and explained the game he was playing that day. Turned out to be, essentially, a variant of Go Fish with some odd rules. Among other things, the victory condition wasn't scoring points, but rather getting your hand down to zero. Also, it was never played with the same cards twice. Once the game was over, and cards left in your hand at that point became truly yours, and the game would begin with a fresh deck.
The Player of Games did a trial run playing for a potion of cure light wounds to show how it worked. Everybody anted up, and two of the PCs decided to play. I conscripted the others to play the NPCs, a Protean and a Qlippoth. The PCs won the potion, the losers took their cards, and then we started the next game, this time playing for what they were all actually here for: a Spherewalker's Staff that would allow them to get off the plane. Everybody anted up for that (a quite higher chunk of change) and the Player of Games brought out the new deck that they were going to play with.
Specifically, a Deck of Many Things.
I'd made modifications to it, of course, filling out more cards to get to the full 52 so that you could actually play a Go Fish game with it. And due to the Player of Games' magic, it worked like he promised. The cards wouldn't truly become theirs until after the game was over. So the one who won wouldn't get any effects, good or bad. But there were two PCs playing the game. And only one had a high enough Knowledge(Arcana) score to know what each card actually did. And the Player didn't permit table talk.
So, yeah, they played Go Fish with a Deck of Many Things. Pretty tense session, that one. But they managed to both win and make it out in one piece. Even got some nifty bonuses out of it, for the one who still had some cards left.