Video games are big business. In fact, the UK video game market is worth over £5 billion alone. For those behind some of the biggest and most popular video games around, branching out into the world of gambling is a sure-fire way to gain an even bigger audience.

So, how do the makers of the top video games transition to online casinos? By making some of the best online slots that there are. The world of online casinos is now awash with great slots that have been based on video games, and this is only good news for players. Here's a look at some of the top games to have made the move across to online slots:

The Book of Ra

Based on the numerous video games that centre around the adventures of Indian Jones, the Book of Ra slot is a great example of how these games can become some of the greatest slots that there are. This title is perhaps the best-known slot brought to us by the developers at Novomatic.

The main character can be seen bearing a striking similarity to Indiana Jones. As you journey back to ancient Egypt, the action for this slot takes place in a golden tomb. With the Egyptian theme comes Egyptian symbols, and you can expect to see pharaohs, scarabs, an explorer, and even the Book of Ra itself. With 5 reels and 3 rows, this slot comes with 9 paylines along with plenty of free spins.

Tomb Raider

2021 marks the 25th anniversary of the original release of the Tomb Raider video game. Alongside the Tomb Raider video games, Lara Croft has also been the subject of some great films too. It makes sense that all things Tomb Raider would find their way to online slots.

In this great online slot, you take on the role of treasure-hunter, Lara Croft. With 5 reels and 3 rows, this slot has 15 paylines. There are plenty of opportunities to win free spins as well as the chance to play a bonus game.

Call of Duty 4: Modern Warfare

The whole series of Call of Duty games stand out as some of the best shooter video games that have ever been made. The makers of the original Call of Duty saw that they were onto a winner, so as well as creating a whole host of sequels, there was also the creation of a great online slot.

With a true Call of Duty feel, the makers at Random Logic have even made the reels appear as if they are being viewed through a night vision scope. With 5 reels and 25 paylines, this video game inspired slot also has a bonus game along with free spins.

Resident Evil

There are numerous video games and films based on the Resident Evil franchise. With a cult-like following, it made sense to take this video game and turn it into another stunning online slot.

The developers over at Skywind created a slot that pays tremendous attention to detail, recreating all that is great about the video game. With appearances from Ada, Chris, Jake, and Leon, this slot has 5 reels and 25 paylines. You'll also find free spins as well as a bonus game with this one.