Pottermore Chamber of Secrets (Book 2) Walkthrough

So I'm back from my vacation to Bali and Lombok today and find out that Pottermore Chamber of Secrets has opened. Then I decide to make this list of item and JK Rowling exclusive content you could find in the chapters also some guide. Hope it helps! :)
Please leave a comment if I miss something etc thanks :)

Chapter 1: The Worst Birthday
The Magic Words
Flower Heads
Honey
Cornelius Agrippa Chocolate Frog Card (later after you get Hairpin in Chapter 4)
Bertie Bott's Sprout Flavoured Bean (later after you get Hairpin in Chapter 4)

Two Enormous Green Eyes
Pruning shears
Dried Nettles
Rose thorns

Chapter 2: Dobby's Warning
Dobby the House-elf
Newt Scamander Chocolate Frog Card

Aunt Petunia's Pudding

*You have to keep the pudding afloat for 14 seconds by clicking it. As a reward, you will get Bertie Bott’s Sugared Violet – Flavoured Bean    

Chapter 3: The Burrow

Harry's Escape

Unlock JK Rowling exclusive content: 'Technology'

Bertie Bott's Baked Bean-Flavoured Bean

Bertie Bott's Pepper-Flavoured Bean
Bertie Bott's Chocolate-Flavoured Bean (thanks to April Drew @ comments)

The Weasleys'

Horklump Juice

De-gnoming the Garden

* 1.When a gnome appears, click on its head and keep the button pressed to grab it.

   2.Keep holding down the button to swing the gnome.

   3.When you think the gnome is swinging fast enough, release the button to throw it over the hedge and out  of the garden.

   4.You’ll have to throw at least four gnomes over the hedge in the time allowed. An accurate and forceful throw will make the gnome fly past the tree stump, earning you a bonus.

(I honestly found this pretty hard to throw the gnomes out over the hedge. You have to click at the perfect timing. Don't click too early or the gnome will be thrown down to the ground. Don't click too late too or the gnome will be thrown up or back to the garden.)

But then as a reward, you will be given 'Gilderoy Lockhart’s Guide to Household Pests'.

Chapter 4: At Flourish and Blotts

Letters From School

* click on the six envelopes on the table in the correct order. The sequence reflects the order in which the breakfast things are mentioned in Chapter Four. If you are unsuccessful, you can always view a further hint to help you solve the puzzle.

Because I'm nice I will tell you the order. Yes, you're welcome.

(5) (6) (3)

(2) (1)

     (4)

After that, click on the paper under the bowl and you will get you second-year shopping list.

Floo Powder

Enchantment in Baking

Charm Your Own Cheese

One Minute Feasts - It's Magic

Fire Tongs

Key
Ignatia Wildsmith Chocolate Frog Card

Floo Powder --> Click the pot near the books,hold it, then drop the floo powder into the fire.

Borgin and Burkes

5 Galleons

Mask

Dragon Liver

Lucius Malfoy

Hairpin --> After you get this you can return to Chapter 1 Moment 1 to find Harry's cupboard opened. There you can find Cornelius Agrippa Chocolate Frog Card and Bertie Bott's Sprout Flavoured Bean.

Peppermint

Magical Me

Encyclopedia of Toadstools

Miranda Goshawk Chocolate Frog Card

Unlock JK Rowling exclusive content: 'The Malfoy Family'

Oh and don't forget to go to Diagon Alley to buy your second-year books!

 ~Chapter 5 coming soon in new post~
Add me on Pottermore: ScarletBlade123 :)

UPDATE!!!
Here's the Chapter 5 link: 'here'