If you're looking for manga similar to MAZE KING, you might like these titles.
Protagonist Kurumi Namihei, who always dreamed about working at Tokyo Dream Land, ends up getting a job at an amusement park far away in the countryside.
Includes the following chapters:
A student is going to a large, popular theme park called "Wandering Wonder World," and he's really excited to see the cleaners there, who zip around on rollerblades. When he follows someone into an off-limits area, he finds that the theme park is actually supernatural! Now that he has seen the dark side of the theme park, what will become of him?
Welcome to Attraction Land. You all have been brought to this world famous amusement park for a certain task that you have been promised an extraordinary reward for helping us with. We will be asking you to carry out a simple monitoring. We will be showing you documents outlining some experimental attractions as well as image videos for them. Oh, and we would like for you to provide at least three points of improvement for each attraction. Answer everything and do not leave any spaces on your form blank. It does not matter how small a thing it is... Now, it is time to begin monitoring.
Masaki's older brother reccommendation landed him in a part-time job at a theme park. But on his first day, a person wearing a bear costume ran up to him shouting "Maa-kun!" and hugged him tightly. Masaki has no memory of this bear (Oosawa) at all. As time passes by, Masaki gradually begins to fall for Oosawa, but the 14 year age gap and the scars left from the past put Oosawa in a difficult position.
It's been a long time since they'd gone out as a family, so Kenji Koyama has taken his wife and kids on a surprise trip. But soon, they get lost, finding themselves at a mysterious amusement park called Happy Land where all the rides are free so that customers can have happiness with "zero lies". But soon, the Koyama family and other park visitors discover the gruesome truth about Happy Land...
Yutaka Hanagasaki is 20-year-old gardener at the theme park Fuegaoka. Merun-chan, the mascot of Fuegaoka, is very popular. Hanagasaki just so happens to secretly like her, but can never work up the courage to even talk to her, always admiring her from afar like a flower. A sweet story of how Hanagasaki works up the courage and becomes closer to Merun!