Secret 1: Right at the beginning, look to the right, there is a HEART hidden behind one of the archways.

Secret 2: Right before picking up the grenade launcher, look to the right, there is a LIFE hidden behind one of the archways (how original).

Secret 3: At the sand pit, right behind where the Scrapjack spawn, there is a hidden location with intense fog. there is a trail of pills just over the hill. You must pick up all the pills and that will spawn a mega health.

Secret 4: By the bridge before picking up the Laser Gun, there is a decoy hidden behind one of the bridge's support.

Secret 5: Right before entering the arena, Sam will say "I smell some serious firepower around here." To the right of the skill point crate, there is a wall that you can walk through and pickup a chainsaw launcher.

Secret 6: Right after entering the arena, to the left, there are 2 windows to the left that lead to a small room with a secret recording from The Second Encounter.

Secret 7: Facing the shielded biomech at the Lavabath Yard, go to the right, and there will be a small entrance by where the buildings are. There will be chainsaw launcher ammo there.

Secret 8: Shoot the large skull to spawn a black hole gadget.