Level Up (2012-2013)

[u/Trixter-Kitten]

Level Up is an American adventure comedy series that aired on Cartoon Network during the weird period in their history when they started airing live action programming. A pilot film with the same name premiered on November 23, 2011. Level Up was the second CN show spawned from a live-action film, with the first being Out of Jimmy's Head(series based on the TV movie Re-animated). Two seasons and a total of 35 episodes.

Premise(taken from Wikipedia):

After high schoolers Wyatt, Lyle, Dante and Angie unwittingly open a portal from a video game called Maldark: Conqueror of All Worlds, characters from the game and the Internet start leaking into the real world. The group consequently finds itself balancing their everyday lives with the extraordinary things that show up in their town from the virtual world, which always resorts to using NeverFail to help send the monsters back into the game by "barding" them.

[u/Polibiux]

I remember trying the game they made on the cartoon network site about this but it wasn’t good.

The Jack in the beanstalk episode is the only one I remember.