Free play casino bonuses are a special type of bonus mostly offered by a range of Microgaming casinos. The casino provides you with a set amount of free chips to play with for a time limit, say 1 hour. You take the free chips and attempt to win more by playing a variety of games. At the end of the hour you are then allowed to keep any winnings you make out of the free chips up to a certain limit (see max bonus column below). The important thing to note is that these winnings are not straight cash that you can withdraw - they are in fact a bonus that you receive with your first deposit to the casino, which is then subject to the usual playthrough requirements, also listed below (see reviews for full details).
These free play bonuses can often be far more lucrative than a straight deposit bonus offered by the casino. Taking the example of Jackpot City, you can win up to $200 during the free play session, and with a minimum deposit being only $10, this equates to a 2000% first deposit bonus. Contrast that with Jackpot City's regular 100% sign-up bonus and you can see why you might like to try your luck on a free play bonus. After all, you can still claim the regular first deposit bonus even if you do not win on the free play session.
Microgaming free play bonuses