Stimuli Cards is a very simple game which includes three solitaire variants to play for free. The included solitaire games are Klondike, FreeCell and Spider with two or four suits. To select the type of solitaire you wish to play, you need to click on the Settings button. For the four games you can redeal the cards whenever you want (start a new game) and undo your last move.
Unfortunately, the game offers very simple graphics and sounds, and there is no music. Moreover, there is only one type of cards, which is not very attractive, and all the variants look exactly the same, except for their respective arrangement according to the rules of the game. You also won't be able to save games, which is really a shame, and the games are not timed. There is no help, so if you don't know how to play these games, so need to look them up on the Internet.
To conclude, apart from the fact that the game is free, I wouldn't recommend Stimuli Cards because you will surely find more attractive solitaire games out there with much more customization options.