As you progress through the game try and collect as many Lore Tokens as you can as these icons will unlock bonuses like bios, comic book covers and concept art.
Debris
The debris you cause by breaking stone pillars and platforms will damage any nearby enemies as well as get you Crystals.
Grayskull Powers
Only use your Grayskull powers when you find yourself in impossible situations because although they will make you almost invincible they are not cheap.
Hidden Lore Objects
To get some of the hidden lore objects you will need to unlock the wall-smashing special move.
Upgrades
Collect the different coloured gems which are called Crystals that appear when you defeat enemies and smash objects as these can be used to buy upgrades.
Collect Lore Tokens...