Besides games there were some interesting things like Tomb Raider concept art and their BAFTA award in a display case. Or the faithfully recreated board in Rockstar offices from the time when they were working on GTA3 covered in sticky notes and concept art.
For the first time I had a chance to play on consoles like Atari 2600, Dreamcast or the first Xbox. The highlight of the exhibition was playing Steel Battalion with it's famous controller. It's a mech simulation for the original Xbox that came bundled with a huge controller specifically made for the game. It has 2 sticks, around 40 buttons and switches and 3 pedals. All the buttons light up when you get hit in the game. It was a great immersive experience.