1. general

Yes, it actually is. In the words fullest meaning: Gratis: Free of charge - we that create the game will never charge you for current or future released content, in paper form or online. Open Source: Free to change - you are welcome to build upon it, modify and change the game, or fork it and make it [...]

When released the game is played either with real paper cards or online. It is up to you and your friends to decide if you do one of those or both. It is always totally free regardless of what form you choose. You would usually need your deck of cards, an opponent with his/her deck of [...]