Here's another game I've heard about that you might like. It seems to be for older users than the Ponystars game, and looks like it could be highly addictive!
"Howrse is a stable simulation game where you breed, train, buy and sell your own horses or ponies as well as run your own Equestrian Center. It’s all free except for buying passes, which uses real money, but you can win passes for free in the game. Passes allow you to buy magical items that will increase your horse’s skills or have another beneficial affect.In order to advance in this game you pass riding levels. For every riding level you pass more and better features are unlocked to you. To pass riding levels you take quizzes with questions pertaining to horses. There are true and false as well as multiple-choice questions. The questions get harder as you advance in the game. As I stated before, more features become unlocked as you pass riding levels. For example, at level two you can become a groom, but at level eight (the final level) you can become a saddler — the highest paying job on Howrse. At level three you can open your own Equestrian Center etc.
Once you retain your own EC (Equestrian Center) you can host jumping, cross-country, and race competitions. For jumping and cross-country you design the course yourself by laying down obstacles and setting the price and level of the required skills to qualify. You can breed horses to produce the top foals and at level four you can view all sorts of info on genetics in the game and breed status. Depending on what your goal is and how far you are in the game, things can get complicated so for the best information read the help files on the game.
Unfortunately, Howrse is only open to English speaking countries, but it is very enjoyable and definitely my favorite horse sim game out there because of the realism it offers."
