Gondal is a browser based game.
The positive effect of this is that you don't need to install anything (ok … maybe the newest version of your browser plus java).
Therefore there are mostly not much features, so that your loading time can be minimized (compared to gemes like WOW, where you have to install the game first).
Gondal is supposed to be free - so you don't have to spend money if you want to start playing a hero. Only If you want to be better than the average in arena and honour you have to spent either a lot more time online or money to buy power crystals.