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As such, it is considered to be incomplete regarding the information available.
The Neo World Program was created by Monokuma as a Killing Game simulator, though it was rewritten by Miu Iruma as part of her plan to kill Kokichi Oma. When a person enters the Neo World Program, their real life body will go into a sleep-like state, and their mind will connect to their virtual avatar.
Things Miu Iruma Modified
Miu rewrote the Neo World Program as her plan to kill Kokichi, doing things like changing her avatar's group from Human to Non-Human, adding a wall that only Non-Human objects can pass, and removing all weapons except for a hammer. She also made it so that every time she touches Kokichi, his avatar paralyzes, modified the map inside the mansion, and added a cell phone so that she could log someone or herself out without needing to go into the salon.
Inside the Neo World Program, there was a Flashback Light that contained the secret of the outside world. This Flashback Light was first found by Kokichi, who ended up using it to sabotage Miu's plan. Kokichi used the Flashback Light on Gonta Gokuhara to expose him to the secret of the outside world. Since Kokichi couldn't murder Miu by conventional means, he convinced Gonta to murder Miu and made it seem like he was saving everyone.