This one gets easier as you play the arcade games. I honestly can not remember if the reward for beating all three was playing arcade games for free (most likely) or getting double the tickets (meh likely). Either way, I'll be as detailed as possible with tips to get the high score for all three games. In order from the last game to play to the first.
You can find all three games in the Souvenir tent located at the carnival. Consumo was the easiest for me to do, I would suggest doing this one last to hear that -ping- sooner for this trophy. In Consumo, you're a Sumo wrestler trying to get as fat as possible. Eating the healthy food adds on pounds, while eating rotten food takes it away. When it comes to the healthy foods, the differ in size from small, medium, and large. Whenever possible, take the bigger helping! Avoid other Sumos or else they may bump you into rotten food or pufferfish. If you hit a puffer, you lose a life. If you lose three lives, it's game over.
Monkey Fling was so weird. It was fun, but weird. You have to fling your poo to hit the bananas and spiders. I would play this game second for a good break. Make sure that you hit at least three bananas for each poo magazine to keep your monkey full. (I can't stop grinning, it's so ridiculous!) If you miss hitting a spider, they will crawl but only momentarily. The farther you are, the better if you miss one! As you play, you'll get better. This game was hard at first for me due to laughter and shock, but once I got into it I beat the high score no problem.
Nut Shots. This game took me the longest to get into, and I would suggest doing this one first. You have to shoot 10 bees to face a bat, and three bats to face an eagle. I moved up and down across the screen and looked out for the bees' stingers that they tossed at me. Take out as many as you can before the bat shows up, and take out the bat IMMEDIATELY before it can use it's sonar attack. You can rush towards it and maneuver around it, but the further it goes, the wider it gets and you'll miss your chance. Clear out all the bees before the eagle comes. Mash that X button, and when he throws the fish you can move up and around it. Repeat until you beat 169600 points. (It's ridiculously high.)