Chika's Escape - Write a letter to Santa

Walkthrough:
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-notice number "19" on the star of the tree. 
 (but its 61.)
-get letter "y" from the window.
-click on the curtain several times and get a key behind the couch.
-move the chair and get a ruller under the desk.
-get a screwdriver from the top drawer.
-get the battery from the bottom drawer.
-move the chair next to the bookshelf and get the letter "r" over the bookshelf.
-look at the toys and notice the foods of the animals.
-change the symbols to:
 fish-carrot-banana
 and get letter "a"
-open the locked drawer with the key and get a pink envelope and a paper.
-put the envelope and the paper on the desk.
-there are 2 books can be read on the bookshelf.
-open the book "saturday" and cut the page with the ruler.
-get letter "m"
-get letter "s" under the bed.
-get letter "r" under the pillow.
-click the left side of the wardrobe and get a magic wand.
-click on the wand and turn it on.
-see number 81 on the heart of the wand.
-click the bottom of the wand and use screwdriver to get the 2nd battery.
-open the wardrobe and get letter "e" in it.
-click on the pocket of the jacket and get the paper.
-go to the toy on the window.
-click his right hand and turn it back.
-use screwdriver on it and put the batteries in the toy.
-click his hand again and press his nose. he will drop a blue paper.
-click the back of the couch and get the paper.
-see the symbols: heart/circle star
-go to the tree screen and click left bottom corner of the tree. 
-there is a hidden pink pencil on the wall. get it.
-write on the paper with the pencil. (the paper and the envelope on the desk)
-the letter is ready.
-the code for the top drawer is:
 star:61
 heart:81
 circle:9 (count the points on the toy at the window.)
 81:9=9
 9*61=549
-enter 549 on the top drawer and get letter "m"
-examine the paper with moon and sun. 
 (? dont know how but this card is called "kanji" and means tomorrow)
-enter the code "tomorrow" on the code of the wardrobe.
-get the last letter "x"
-go to the door and put the letters: "merry x'mas"
-click on the door and escape with happy end.