What are some challenging things to do in solitaire?

[Jonas]

We're working on some achievements for our next version of Solitaire, and thought I'd ask and see if anyone has some ideas.

So what are some challenging feats that you can think of?

[Primal Instincts]

This may be off the wall but what about a "Win" card.....a hidden special card and it can only be found by using a certain strategy or a certain move......and when you make that move the card appears and if you can play it you instantly win the game.....not sure how that would work but it would be kinda cool.....my other thought was a bonus version....if you can finish in a certain time frame you might win a token or tokens to purchase stuff with....

[luvcookies]

thats what i was thinking about the tokens and coins but more like if you win 4 or 5 in a row to get that
the win card be cool

luvcookies

[PandoraEllen]

I played Westcliff close to 20 times in a row and never lost 1 game. also the cards are slanting to the left making it hard to see if u have a long run of cards.....Perhaps it was luck but I don't think so.