I don't understand how to play 
I have to apologize for the lack of information. Assuming you already went through http://taabl.net/howtoplay let me tell you that playing is much MUCH simpler than understanding the how to
- Elect your game(s), from Pick 2 to Pick 5 (the number after the Pick is the number of characters that will be matched, the larger this number the less likely it is to match with the next block).
- Place your bet(s) - careful not to use web wallets where you don't control the addresses and private keys, as the wins will be paid back to the address you sent from.
- After two confirmations the bet is added to the Pick, you can see which is yours by looking for your payment transaction hash.
- When the pick matches, a winner is found. The winner gets the pot, all others get a few satoshis (same number as the Pick) to signal the pick has ended.
I'll be glad to go into detail on any part of the workflow, just let me know what your exact questions are.
I'm also having some hard time in order to understand this game.
I'm unable to figure it out what the odds involved in this game are.
BTW would you mind creating one more column in order to add the odds for each PICK? (And one else adding the players already in).
Or, at least, that kind of info might be included in the "how to play" section...
The odds are dependent on how many others are playing, it is the same as a raffle. The selection numbers are the last digits of the block hash, for example "4d783" in this block: http://blockchain.info/block-height/237472
The odds of any winner in a pick 3 is 1 in 16^3, or 1 in 4096. If you hold 1 ticket and 19 others are holding 1 ticket, you have a 1 in 20 chance of winning (eventually). Of note, it doesn't matter when you join a game, as you have to hold the ticket number when it hits - meaning you can't have the prior block be 12345 and then you select ticket #12345.