On top the hub's first building are several items. Collect the following in order to gain an Invincibility Combo - Cake, Hammer, Earth, Apple, Tap. Note that this only lasts for one level, so you'll have to return and collect the items again for multiple levels.

On the far right in the hub (the lower side building) are several items dotted around on the ledges. Collect the following in order to refill your power batteries - Penguin, Oil Can, Wine Glass, Earth and Racket - spelling POWER.

Around hub's first building on the ledges are several items. Collect the following in order to gain an Unlimited Lives Combo - Lips, Ice Cream, Violin, Earth, Snowman - spelling LIVES.

Enter the code's on the Password Screen, in Continue Game Option, on the Main Menu of the Game.

At the start go to the first building then stretch up to collect in this order:
Cake, Hammer, Earth, Apple, Tap you are then invincible, the older among you like myself will remember this from the Amiga version. You may need to redo the task to get the invincibility before starting a new level or it may expire in the new level when sent back to the hub.

Collect the following items in order to gain an Unlimited Lives Combo - Lips, Ice Cream, Violin, Earth, Snowman - spelling LIVES.

Collect the following in order to refill your power batteries - Penguin, Oil Can, Wine Glass, Earth and Racket - spelling POWER.