Parchment is so passe. A German couple planning their wedding made a Mario-inspired PC game for their invitation. Friends and family had to beat the game to get the wedding details. If you promise not to show up, you can download the game here (It’s small & virus free).
NOTE: I downloaded and installed it to make sure it works and all went well except the only way I could figure to exit was Task Manager (CTL+ALT+DEL). I’m not a gamer, or friends of the couple, so I had no interest in playing it through.