Okay now u've got to the end of the game and there's just one more battle left to fight.the final boss is hardly tough.

There are two stages and in the first take out you're gauntlet and keep hammering her.dont bother about you're health.whwn she goes down to half her health she will choke hold kratos and start draining his health .press L + R as rapidly as possible but be ready to play a mini game rapidly.

After you chain atlas she applies a different technique.immediately keep pounding her with the light of dawn till she hangs on the ledge then jump and press L + o to quickly kill her.

After repeating a few times she falls down and there's a black aura around her.now go to the middle of the arena and press L ,follow thw button prompts and she's finished.

When fighting the chimera boss for the second time stay near it's head. He will only do his double bite attack which can be easily blocked compared to it's claw smash which is unblockable though you can parry it. When he does his flamethrow attack just double jump and press L + square. This will avoid all damage taken and also hurt him. When he goes on top of the building don't start evading straight away ,run around till you get near and then evade.
With this it's possible to complete god mode battle without taking any damage.

You know that Challenge of Hades that you unlock after beating the game once...
Well if your up for the challenge then it is right for you...

After beating the game the God mode is also unlocked...But it is extremely hard because you inflict less damage ut take more damage from enemy attacks so be careful...

The funside of the game is when you unlock all the costumes...It gives special abilities to Kratos...It is like a God of War with Cheat...

But if you're asking about those lost levels,I don't actually know if they do exist or if they are in the game...

Hope this Info helped a bit...

If you can't pass a level, just die a few times and eventually Kratos will gain additional health before your fight. You will start at your last check point in the game so you can continue the fight again and again till you pass it.

If you can't beat a part in the game and you have the gauntlet of Zeus, use the gauntlet instead. It does more damage so you need less hits on your enemies. Also, it's powerups are very useful like L+triangle and L+square.

When battleing Persephony, don't use your comos (L+square, L+triangle, and L+circle). Those moves take awhile to finish and gives Persephony more time to hit you with powerful move. Also, some moves you will not be able to block with the shield. Dive away from her when she begins to attack.