First, all aces and deuces, or twos (16 cards in all), are removed from the two decks. Then the remaining 88 cards are shuffled and nine of them are laid out on the tableaux in an inverted "V" formation. Although this is one of the two bases mentioned above that gives the game its name, the player can opt to just lay the nine cards in a straight line. These nine cards start each of the nine piles in the tableaux.

Building on the 16 foundations is up by suit in intervals of two. Therefore, building should be like this:
On the aces: 3-5-7-9-J-K
On the deuces: 4-6-8-10-Q

Building on the tableaux is down, also by suit in intervals of two (i.e. the 5 must be placed over the 7). A card can be placed over an applicable card and any gap must be filled immediately with a card from the stock. A sequence of cards (such as 6-8-10) can be moved as one unit. Any card can be placed on the foundation at any appropriate time.

Once all possible moves have been made or the player has done all moves he wanted to make, a new set of nine cards are dealt, one for each pile. Moving, filling gaps with new cards, and dealing a new set of nine cards continue until the stock has been used up. After this has happened, building continues, but spaces left behind are not filled.

The game is successfully won when all cards are built with the Kings and Queens at front.

First the cards are dealt into thirteen columns of eight cards each. The player will then aim to form eight full suit sequences of 13 cards each. Every sequence should run from King down to Ace.

To achieve this, the cards are built down regardless of suit. One card can be moved at a time, unless there are two or more cards of the same suit forming a sequence (such as 7-6-5-4 of spades) at which case they are moved as a single unit.

When a suit sequence is formed on the same column, running from King down to Ace (such as K-Q-J-10-9-8-7-6-5-4-3-2-A of clubs), the sequence is discarded. This game is won when all eight such sequences are removed.

Like in Spider, it is generally a good idea for the player to built down in suit whenever possible because the earlier this is done, the sooner a sequence is removed, giving the player more space to maneuver.

First, forty-eight cards are dealt into twelve piles of four cards each, forming three sides of a square. The rest of the deck consist the stock. Fourth "side" of the square is left to be occupied by the foundations.

The object of this game is to place the Aces as they become available and build each of them up to kings.

The top card of each pile is available for play, to be built on the foundations or on another pile. Cards on the tableaux are built down in suit and sequences can be moved as a unit. (Solsuite's version of the game, however, does not allow moving sequences as a unit) Spaces, whenever they occur, can be filled with any available card or sequence.

When there are no more plays on the tableaux that can be made, the stock is dealt one at a time, and any card that cannot be built on the foundations or on the tableaux can be placed on a waste pile, the top card of which is available for play. The stock can only be dealt once.

The game ends soon after the stock has run out. The game is won (which is very likely) when all cards are built onto the foundations.

Cards are dealt into eight columns of six cards. They are dealt in such a way that no two cards in the same column have the same rank. If it is about to be the case, the card about to dealt is placed at the bottom of the deck and a new one is dealt as long as its rank doesn't match with any of the cards already in that column.

Once the eight columns are dealt, the four remaining cards are placed either face-up or face-down in a row above or below the columns. These four cards will be the reserve.

Play is composed of removing pairs of cards with the same rank (such as two kings or two 7s). All cards in the reserve and the top card of each column are available for play. Once a pair has been removed, new cards become exposed and available for play.

The game is won once all cards are discarded.

Game play consists of a tableaux with four piles of four cards each (one face-up card on top of three face-down cards). A seventeenth card is put in the first of four foundations. Cards with the same suit as this card must be moved to this foundation and the three other foundations must begin with cards of the same rank. All undealt cards make up the stock.

The top cards in each pile in the tableaux are the only cards in play and must be moved to the foundations. A card can be moved to a foundation if a card of the same value has already been placed in the foundation before it. Once cards have been placed on the foundation, any face-down cards remaining in the tableaux are turned face-up. When placing cards from the tableaux is no longer possible, one can use the stock, deal three cards at a time, and use its top card to make possible moves. One can redeal the stock as long as there are possible moves from the stock or from the tableaux to the foundations.

Here's an example (foundations only):

 7 8 10 2 4 9 K A
 7 A 8 K 9
 7 8 K

Suppose that from the example above, any heart card can be moved to the top foundation. One can also place 10 into its foundation, but one cannot put 2 yet into its foundation because 2 hasn't turned up yet in its foundation. No club can be played at this time as the 7 hasn't appeared.

The game is won when all cards have been moved to the foundations. But winning any game can rely on where certain cards are placed in the either one of the piles in the tableaux or in the stock pile. Because of this, finishing a game of Osmosis is slim if not rare.
Notes
There is no limit to the number of redeals allowed, the cards are actually only dealt one at a time. As coded, this game didn't play according to these rules. The Pysol III version does and it's far easier to win. Also, autodrop is disabled as the play is trivial otherwise.

First, one king and one ace of each suit is removed and the aces and kings are each lined into columns to form the foundations. The aces are built up while the kings are built down all by suit.

Between the two foundation columns, the player deals a row of ten cards, forming the tableaux. All of these cards are available for play on the foundations and the spaces they leave behind are immediately filled from the stock.

When play comes to a stand still, a second row of ten cards is dealt below the first row. All cards are still available for play and the spaces left behind are immediately filled from the stock.

When play comes to a stand still a second time, a third row of ten cards is dealt. At this point onwards, the following rules apply:

• A card is available to be built to the foundations if at least one of its narrower edges is free. Therefore, the cards at the top and bottom rows are available for play and card in the middle rows becomes available after a card immediately above or below it is played.
• There is no compulsion in filling spaces in the tableaux. As long as there are moves available for player to make, spaces can be filled later.
• All spaces in the tableaux must be filled when play goes on a standstill. The order is from left to right, top to bottom. There is no building at this point.
• Only when the existing spaces in the tableaux are filled is the time another row of ten card is dealt at the bottom of the existing rows.
• Peeking on the next card in the stock is absolutely not allowed; doing so will force that card dealt to the tableaux.

Also, reversals are allowed in the game, i.e. when the two foundations of the same suit meet at one point, the player can move the cards from one foundation to the other except the base cards (Ace and King) of the foundations.

The game ends when play stops after the stock has run out. The game is won when all cards are built into the foundations.

First, the four aces are taken out of the deck. These form the four foundations.

Then the rest are shuffled and dealt into twelve piles of four cards each. One can distribute one card at a time for each pile or deal four cards at a time to form a pile.

The top cards of each pile are available for play to the foundations or on the tableaux piles. The foundations are built up by suit, with the cards on the tableaux are built down, also by suit.

One card can be moved at a time. However, the player is allowed to move a sequence of cards as a unit to another pile with an appropriate card (e.g. 6-5-4-3 of spades can be placed on the 7 of spades).

When all possible moves are made (or the player has done all the possible moves one can make), the piles are picked up in reverse order. For example, the twelth pile is placed over the eleventh pile, and this new pile is placed on the tenth pile, and so on. Then, without shuffling, the cards are dealt to as many piles of four as the remaining decks will allow. To ensure that the order of the cards is not disturbed for the most part, it is suggested that the cards are dealt four at time. This can be done only twice.

The game is won successfully when all cards are built onto the foundations up to Kings.

• At the onset, no card is placed in the foundations; aces and kings needed are mixed in the deck.
• Reversals are not allowed.
• SolSuite's version of the game allows one redeal while Pretty Good Solitaire's version doesn't allow any redeal.

First, the four aces are separated from the rest of the deck and placed side by side in two cards of two, forming a square. The four waste piles, which initially would contain a card each, are located at the corners of the square.

Building on the foundations is up by color (red suits on red, black suits on black, no matter the suit) to kings. The player first examines the cards to move any cards that can be built on the foundations. If a gap occurs, it is not immediately filled. Only one card can be moved at a time.

After the sufficient cards are built, four cards, one at a time, are dealt onto any of the wastepiles (not necessarily one on each waste piles). Afterwards, any cards that can be built to the foundations are moved. There should be no building on the wastepiles themselves. The process is repeated, i.e. dealing four cards any on the wastepiles and moving any available cards (the top card of each wastepile) to the foundations over and over, until the stock is exhausted.

After the stock is exhausted, the player can do a redeal. To do this, the player must pick up the four waste piles in any order one wishes, and without shuffling, restarts dealing four cards, restarting the process. The game ends when this second stock is used up.

The game is won when all the cards end up in the foundations.