Although the game costs nothing to download, you only get to play the prologue for free. After this initial section is complete - it totals about an hour - you're plunged headfirst into in-app purchasing territory. Final Fantasy Dimensions is divided into four chunks, the first of which costs a modest £1.99 and covers around five hours of gameplay. So far, so good. However, the remaining three instalments are weightier and consequently demand more cash: £6.99 a pop, to be precise.