On my phone, I play a game called Designer City. In a nutshell, it is a city-building game for mobile devices; thanks to SimCity 2000 years ago, I do enjoy playing city-building games and Designer City is one that I've found that has an easy interface and isn't time-consuming, which is ideal for a touchscreen.
In the past day or so, the developers - Sphere Game Studios - released an update to the game, which included an "Easter Egg" that consisted of a hidden "mini-game" within the game, as a part of an extra activity for the holiday season. The mini-game was also a competition, in which the first person to finish it and post a screenshot to the developer's Facebook page or e-mail address would result in an in-game reward.
I found the mini-game and played it without any expectations. To my surprise, I not only completed it but my score of 503 became the highest on the leaderboard (and it still is, as of this writing). I photographed the score and sent it to Sphere Game Studios in case I might have won; shortly afterwards, I received a reply, which stated that while someone else had already come ahead of me, I was second place and would still receive an in-game reward for my achievement.
I am happy about this result. I played the mini-game without the intent to win anything but when I completed it, which was a surprise in itself, I thought it might be early enough to e-mail the developer and see what would happen. Second place in a competition where theoretically anyone in the world with an Android or Apple device could play is an achievement, even if it's only in a computer game.