Since the knowledge of time travel has been lost, I instead make a time stopping machine, that stops time for everyone but the user, creating an indirect time-forwarding machine. I then kill every person on the planet at once (excluding the hydra, the godmodder, and anyone participating in the game), to ensure that nobody may interfere.
I leave one person alive, though, and I torture them until they give me the nuclear launch codes. I launch every nuclear missile that I have possession of at the hydra (freezing time at appropriate moments so that they all come in one large blast), and proceed to arm every other person participating in the game with heavy experimental weaponry. A dozen nanosuits armed with heavy QMGs rush at hydra. In a standard scenario, that would disintegrate the molecular bonds of the enemy's molecules, causing uncountable amounts of small explosions to take place in the bullet hole of the enemy, slowly blowing the enemy apart until nothing is left.