The first customised regional game was launched in December 1998 and saw the landmarks of Edinburgh swap places with the traditional Monopoly London sites and sights. The most recent launch was a Monopoly Tottenham Hotspur game in November.
In between the company has produced many regional, soccer and University customised editions, all loyal to the original game with the key Monopoly icons remaining in places and only the street names altering. The actual one millionth game sold was a Monopoly Liverpool FC edition.
Commercial director Mark Marriot (pictured) said: "When we began producing the regional board games we had no idea of the market capacity. But a decade on the games are proving even more popular than at the start.
"There are several reasons, we believe, for this. Firstly we have now got an even better feel for the product and have developed a mature distribution and retail network.
"Also, we are discovering smaller more compact cities and towns are proving just as popular as the bigger locations. That's because the loyalty and pride factor is all the greater in these tighter-knit places.
"We still have a lot of the big cities left to do - including Belfast, Cardiff and Leeds - but also many UK towns too, following recent spectacular successes in Wigan in particular - and also Reading and Ipswich."