Freeroll Tournaments are tournaments with no entry fee or initial buy-in. Freeroll Tournaments are clearly marked in the Full Tournament Lobby.
In Multi-Buy-In Tournaments, instead of a fixed buy-in players may choose between a set minimum and maximum buy-ins. Their starting stack is scaled in proportion to buy-in.
A re-buy tournament is one in which you have the opportunity to buy more chips during the event. In a standard ‘freezeout’ tournament, when you run out of chips, you’re out of the tournament. In a re-buy tournament, you can (with some restrictions) buy more chips.
In a Bounty tournament, a part of the player’s buy-in is added to the player’s "bounty". If it's a Progressive Bounty tournament a % of the bounty amount is given to the player that knocked him out and a % is added to the bounty of the same player. If it's a regular Bounty the full Bounty amount is given to the player that knocked him out. In case of VIP bounties, a unique player bounty, the bounty will only go to the player knocking out the VIP. If the VIP makes a rebuy, the VIP bounty is not credited to the player winning the previous hand.