Lots of fun, and lots of things to do, but not overly challenging. Once you have airports up, you can just sit back and watch the money roll in... The AI isn't very challenging either, if you really want OpenTTD to challenge you, you have to impose restrictions on yourself like "Only use railroads" or "Only produce and transport goods".
Still an awesome game though :)
Game: Planet M.U.L.E.
Yes, we all hate installing proprietary software, but is this really a reason to give a game 1/10, huh ?
Game: Balanced Annihilation
Understand that this for the most part is a hardcore RTS. You need to be very quick and make complex decisions understanding every aspect of the situation and your capabilities while predicting the enemy's actions. This is like games such as starcraft. Don't play it expecting it to be casual at all.
Note: Recent proliferation of '8v8DSD' games are much slower paced and more forgiving, but they are also not all that entertaining
I didn't even know this was available on linux. I used to play it when it was a just a flash game and then when they made it in to a windows executable.
It is very fun, challenging and worth a look.
Game: World of Goo
Very fun. Worth every cent I payed for it.
Easy for casual players to pick up and play and for intermediate-hardcore gamers to play competitively to try and make the tallest stable structure with the leftover goo from all the levels.
The first time I tried to play I couldn't quite understand how to get started but after reading a quick tutorial I started and didn't want to stop. This game deserves more attention. I don't often play simulator games but this one kept me playing for hours for some reason. I suggest if you haven't played it before, give it a try.
I can't stop playing this fun sandbox game.
So many ideas of things to create, so little time.
The game is still in Alpha but has a promising future. Frequent updates every few weeks.
I hope when the game reaches Beta that the code gets optimized to allow people with slightly older machines to play with greater render distances to be able to see the sun and moon from my crappy Intel integrated video card on my laptop.
Hopefully in the future other game modes come and many more features and bug fixes for multiplayer.
You have to buy it to get access to the full feature set. Supporting devs = allows them to put more time into making worthwhile games.