To obtain this ending you must first collect the key and unlock the security gates. Once through you will be faced by Secuity and you must defeat him to enter the tent then you will hear an Imaginary voice which will mock you about defeating an imaginary boss in an imaginary game on the easiest difficulty. After this you score the Security Trophy, a silver trophy with the same shape as Security. It is the only ending that do not give a trophy, unless you do not have completed the 4th glitch Ending first.