RULES AND FEATURES
Free cell is found in different interpretations, this option, for example, called Fortress. I must say that in this case, the name is chosen right. But in order to feel it you need to play 4 rounds (levels) in a row. You seem to be defending the fortress from invasion of enemies. There's even cards styled appropriately.
The Main feature here is a small change of conditions during the transition to the next stage. On the first level, free cells (Free Cell) in which you temporarily store cards during the transitions, four. On the second only 3, third — 2. The fourth and final level of the game provides only one free cell.
Based on the foregoing, it can be assumed that the complexity of the analysis of the solitaire grows from 1-St to 4-th level. However, the simplified rules of changing maps make this increased complexity is almost invisible. Judge for yourself, here it is possible to shift any suit anywhere, and it applies both to one card and the whole sorted column. Change in the rules left one: you can put the card on the card only if it is a unit under the rank.
This version of solitaire works on many devices: PC, tablet, phone, TV...
You can play the game FORTRESS SOLITAIRE FOR TABLET online 24 hours a day for free. It is no need to download and install it on your computer, and it is also not required you to be the registered user. Just ckick and enjoy. See also a set of related games below on that you might be interested to look.