If you're looking for anime similar to Exper Zenon, you might like these titles.
Fame. Glory. Power. Anything in your wildest dreams is possible when you reach the top of the Tower of God. Those lucky enough to be chosen by the tower ascend each floor in hopes of fulfilling their dreams, but to succeed, they must complete dangerous and deadly tests along the way. But there are others who can enter the structure on their own free will; these "irregulars" are feared by many and are said to leave chaos and change in their wake. Twenty-Fifth Baam is one such irregular who begins to climb the Tower of God in hopes of reuniting with his childhood friend Rachel, but as he soon discovers, this perilous path will put him in the crosshairs of fierce competitors, untrustworthy rivals and terrifying monsters, and he might not make it out alive...
Hope’s Peak Private Academy is a super-exclusive institute that gathers the best and the brightest, provides them with a world-class education, and propels them into any career they wish. At least, that’s what the average student Naegi used to think. Having been accepted into a class of 15 students through a lottery system, the boy quickly comes to learn that Hope’s Peak is no ordinary school. In reality, he and the group find themselves trapped inside and learn that the only way to "graduate" is to murder a fellow student and fool everyone in a trial that determines life or death! Led by the whimsically-cruel, teddy-bear-like Monobear, Naegi and the others must do whatever it takes to escape this bizarre, deadly game.
An unpredictable battle of superpowers. Kaname Sudo, an ordinary high school student, receives an invitation email to try a mysterious app called "Darwin's Game." Kaname, upon launching the app, is drawn into a game where players fight one another using superpowers called Sigils. Without knowing the reason for all this, can Kaname survive furious battles against the powerful players who attack him?
As his classmates celebrate their middle school graduation, troubled Mirai is mired in darkness. But his battle is just beginning when he receives some salvation from above in the form of an angel. Now Mirai is pitted against 12 other chosen humans in a battle in which the winner becomes the next god of the world. Mirai has an angel in his corner, but he may need to become a devil to survive.