Every now and then I look on Steam for the absolute cheapest game. If it has Steam cards and looks vaguely interesting I tend to pick it up in the hopes I'll eventually play it. Frankenstein: Master of Death is a game that was on sale for 16 cents a couple weeks ago and said it was a 'hidden object' game. I enjoyed playing a 'hidden object' game on Facebook but eventually got put off by the free to play business model... So I thought putting up 16 cents for a game without those annoying paywalls was a worthy risk.
It ended up being more of a point and click adventure game in the sense that you had to find keys that fight the right doors to progress through the plot. Finding the keys was pretty trivial; remembering where the lock was happened to be a little annoying. Only occasionally did you get into a 'hidden object' minigame and those only ever had a fixed 12 things to find. Not the best offering for someone who just wanted to click on a bunch of hidden objects.
Ultimately I beat the game in a little under 3 hours. I wouldn't say it was the most fun I ever had playing a game, but it was reasonably fun. I had to leave the game running in order to collect up the Steam cards that came with it (they added in a refund option to return a game with under 2 hours played so now cards won't drop until you've clocked at least 2 hours in a game) and ended up selling the cards off for 26 cents after Steam fees.
All told I made 10 cents and got to play a decent enough game. I'm not sure it was actually an optimal use of my time, so maybe buying the cheapest game on Steam is actually not a very good idea...
On the plus side, it is now the second game in which I've earned 100% of the achievements. Huzzah!