This is one of 3 online slots called 'Gladiator' that players can now play online. Of the other two, Microgaming's version is pretty poor but Playtech's Gladiator Slot is the best of the lot: just sbrilliant. This version of Gladiator is from Betsoft and can be played for real at Players Only Casino. The two feature rounds are rarely that lucrative - 5 - 15x at tops, however the expanding wilds can produce some big wins on rare occasions. It's low variance, meaning lots of small wins and an occassional decent one, so knowing when to cashout is a key. Don't set your sites too high, but it is very entertaining.
It's not quite as good as Playtech's Gladiator slot to be honest (see the video below) but it definitely has the playability factor. If you want some more information on the Playtech version of Gladiator, based on Ridley Scott's film of the same name, including a list of online casinos that currently have it in the download version, check out the Gladiator Slots information site. It also has a winner screenshot gallery showing some decent wins.