Grave Danger

Grave Danger is one of the 17 hidden Mini-games which can be accessed by using Cheat Engine.

In this game, Graves will appear any time in the game. During the first flag, some zombies will come out from some Graves.

Gain Access to Limbo Page
Add three addresses and change all the value to 144.

see video tutorial.

Strategy
Just do whatever you did in the original Night levels. The difference is the graves will appear anytime. You have to use Grave Busters more often.