I think what come to your mind when you think of Japan are food and traditional culture. Japan has a lot of historic buildings and unique traditional culture. Many people also know Japanese food such as sushi, sashimi and sukiyaki. Japanese games are less well known than these two but I think games are also a symbol of Japan. Japan has a lot of famous game company like Nintendo or Konami and they have been making unique games for a long time. Some of them are well known to people all over the world. Then I’ll introduce particularly popular ones from the many.
1 Pokemon Let’s go Pikachu! ・ Let’s go Eevee!
2 Super Smash Bros.
3 Animal Crossing New Horizons
4 Splatoon
5 Super Mario Brothers
1 Pokemon Let’s go Pikachu! ・ Let’s go Eevee!

Player character (you) catch, raise and train pokemons. You’ll go on an adventure
to become a professional pokemon trainer. You’ll meet either Pikachu or Eevee when you begin your adventure. Pikachu or Eevee will be your partner throughout your adventure and grow with you. Along the way, you’ll help all sorts of people and thwart the dastardly plans of those who wish to take advantage of Pokemon for their nefarious ends.
2 Super Smash Bros.

Super Smash Bros is a battle game that uses various technique to defeat your opponents.
You can choose one character you like from about 70 characters. Many famous character such as Mario, Kirby, Samus and Zelda are there. Attack your opponents, build up their damage and launch them off the stage! You can also use various items. These can be the key to victory! You can play with up to 4 so it will be more exciting when you play with friends.
3 Animal Crossing New Horizons

In this game, You’re free to do what you’d like! You have both the tools and freedom and You can also craft items by following DIY recipes and using the materials you’ve gathered so you can create the island paradise of your dream at your own pace.
From fish to catch, bugs to sneak up on and residents to be friend, you’d be amazed how much there is to discover when you explore your island. Enjoy the relaxing life in island with friends!
4 Splatoon

5 Super Mario Brothers

I think Super Mario is the most famous game in the world. It has been loved by many people since the first game was released in 1985. Player complete various missions and leads Mario to goal. It takes a lot of time to finish the game’s story.
Super Mario maker 2 and Mario Kart tour was released recently and is very popular.
I recommend you play Super Mario 64 and Super Mario Sunshine. You complete the game’s story by collecting all stars. This is very difficult but very interesting.
<references >
https://pokemonletsgo.pokemon.com/en-us/story/
https://www.smashbros.com/en_US/item/index.html
https://splatoon.nintendo.com/game-modes/