Ode to Joy
Like in the first game, you hover over the following buttons to activate the egg: Duel x2, Challenge, Replay x2, Challenge, Duel, Quickplay, Adventure x2, Quickplay, Duel x2, Quickplay x2. In this, you are "awarded" a trophy in the shape of Beethoven's mugshot. This trophy doesn't get displayed in the Trophy Room, only during the egg.