What are all the correct answers to the Squirrel's questions, and what is the reward when I get them all correct?

Solution 1:

First one : do you really love candies? (answer in english)

Correct answer: "yes" (just like in Candy Box 1)
^{alternatives: "y", "yeah", "yeap", "yep"}
Reward: 20 candies

Now complete this sequence of letters and you'll get a new reward : S, E, I, D, N, A, ?

Correct answer: "C" (it's CANDIES spelled backwards)
^{alternatives: "letter c", "the letter c"}
Reward: 100 candies

Next question : how many candies does the candiest person in the world possess?

Correct answer: [however many candies you have currently]
Reward: 500 candies

In an ancient forest grows a very old tree, on which live the most intelligent animals in this world. It is said that this tree has 60 roots, 360 branches and 2160 leaves. How many marks can you find on its trunk?

Correct answer: "10" (the squirrel is talking about the tree that he is on)
^{alternatives: "ten", "10 marks", "ten marks"}
Reward: 3 lollipops

Under a full moon, I throw a yellow hat into the red sea. What happens to the yellow hat?

Correct answer: "it gets wet," or "it floats"
^{alternatives: "wet", "it becomes wet", "it become wet", "becomes wet", "become wet", "it get wet", "its wet", "it got wet", "it is wet", "it is wet now", "its wet now", "float", "floats", "its floating", "it is floating", "floating", "it float"}
Reward: 3 chololate bars

The game is Tic-Tac-Toe. We play on a 3 by 3 game board. You will use the X sign while I will use the O sign. We place our signs alternatively, and the goal is to get three signs in a row. I'll let you go first!

Correct answer (solution): first go in the middle square, then any corner, then get three in a row by going outside of the grid

      _____________________
     |      |      |  __  |                                       
     |      |      | |  | |                                       
     |      |      | |__| |                                       
     |______|______|______|                                       
     |      |      |      |                                       
     |      |  \/  |      |                                       
     |      |  /\  |      |                                       
     |______|______|______|                                       
     |      |      |  __  |                                       
     |  \/  |      | |  | |                                       
     |  /\  |      | |__| |                                       
     |______|______|______|                                       

 \/                                                               
 /\                       

Reward: a key to open one of the locked houses in the village

Solution 2:

For the tic-tac-toe, think about having an extra 3 boxes at the top of the box and just click on those. You can use any space right next to the box and it will count.