Because MeggieSoft Games Canasta supports both rule sets, they can be mixed-and-matched. For the most part, this means selecting individual Modern American Canasta rules as variations to the Classic Canasta game..

Canasta utilizes the traditional MeggieSoft Games foundation user interface, common to all our games. This incorporates some new features specially created for Canasta, which include the following. (The first four of these are also implemented in version 15 of the other games, as appropriate.)

• "MultiSelect". Using the right mouse button: click down and drag over a series of cards to select them for melding. and then release. If AutoMeld is active and the meld is valid, the cards will be selected and melded in one action.
• "AutoMeld". Automatically melds a MultiSelect group when the mouse button is released, automatically melds a taken discard, and enables the ability to double-click on a card to add it to the matching rank meld. (Wild cards will be added to the last meld played; cards of previously unmelded ranks will create a new meld).
• Step-by-step Undo: Because of the large number of melding actions that can occur in a single turn, the undo facility can either undo the last action or the entire turn. Step-by-step undoing of each action of the current turn is supported.
• Customizable meld display: You will be able to specify that melds are displayed in one of the following ways: in the order played, sorted by length, sorted by rank, or in fixed rank column positions.