17 * This can be "grow", "fireflow" or "iceflower" at the moment
19 virtual void set_bonus(const std::string& bonus) = 0;
21 * Make tux invicible for a short amount of time
23 virtual void make_invincible() = 0;
25 * Give tux another life
27 virtual void add_life() = 0;
31 virtual void add_coins(int count) = 0;