Games & Watch: Super Mario Brothers has some hidden features

Game & Watch: Super Mario Brothers Handheld officially released on November 13th, offering another way to enjoy the legendary platformer. However, there are some small Easter eggs and secrets you can use, and Nintendo has given you some tips on how to access them.
Defeating Super Mario Bros. for the first time on your device will give you access to a new hard mode. This mode was lost when I turned off the original NES, but thanks to technological advances, I no longer have to lose access!
When you exit Super Mario Bros., the hard mode with various enemies will be unlocked.
In the original game, hard mode was only available until you turned off the NES! pic.twitter.com/d31WRDZIyN
— Nintendo of America (@NintendoAmerica) November 13, 2020
Press and hold the A button on the title screen to unlock “Infinite Mario” mode, remove life limits, and continue playing indefinitely. This is a great option if you have a system for young players, or if you have been a little rusted over the years.
Unlock Super Mario Bros. and Super Mario Bros. Infinite Mario Mode. Hold down the A button on the title screen and lose the level.
Voilà, the game isn’t over anymore! pic.twitter.com/PxYdjFIyUf
— Nintendo of America (@NintendoAmerica) November 13, 2020
In the traditional game & watchball game update, you can also play as Luigi by holding down the A button for more than 5 seconds. You may also see Easter eggs on the included clock based on the time of day. Since the launch of Super Mario Bros., there have been a total of 35, one each year.
Game & Watch: The Super Mario Brothers system sold out quickly every time it was restocked, and critic Steve Watts was pretty warm. It’s a small, attractive device with some limited functionality, celebrating Nintendo’s most important year.
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https://www.gamespot.com/articles/game-watch-super-mario-bros-has-several-hidden-features/1100-6484455/?ftag=CAD-01-10abi2f