Give me the gummy

Overview my game:

The player takes the role of Noona – a girl holding a gummy bear box. Her younger brother, Danny, likes jelly and ask her for that box. Noona doesn’t want Danny to get the gummy box easily, so she starts a game. The quantity of bears in that box are between 100- 1000. Only Noona knows exactly the number of bears in that box. Danny has to guess the number of bears if he wants to get the jelly box. Danny has 10 chances to guess. If Danny gets the right number, he will receive the jelly box (the player loses). If not, Noona still keeps the jelly box (the player wins).