This is one massive game. Odyssey now fully consists of RPG elements: a leveling system, talent trees, and dialog options which may affect cutscenes or the ending. You also will opt to choose either Alexios or Kassandra as the main character of your adventure.

Exploration has never been so amazing in this game series. I was so delighted and mesmerized as I explore the world of Greece in this game. Synchronizing viewpoints was one of my favorite activities. Moreover, you will see various "Historical Locations" which I believe might be real places all over Greece. The world design is so complex, every place is pretty much unique - That's what makes it so beautiful.
Like Origins, this world of Odyssey also consists of various tombs (but of course not Pyramids in this one), and after completing it, you will obtain an ability point.

The new combat system has been revised, which makes it even more complex: Each tree grants you various active abilities where you can assign and then use it during a fight. You now collect every piece of gear (head, chest, hands, legs, feet, bow, weapon) and either replace the old ones by new ones, or upgrade by a blacksmith. Compared to Origins, you were gathering materials to upgrade weapon / bow damage. You still have to gather materials to upgrade your gears when going to the blacksmith. Also a new feature called "engraving" whereby you choose to add some additional stats to one of your piece of equipment according to your style of play.

The Naval system is now a crucial part in your journey in the huge world. You will require materials as well to upgrade your ship. You can now add a Lieutenant to your ship, where each will add a beneficial stat to your ship. You get one additional Lieutenant as you upgrade the hull of your ship - up to 4. Whenever you are boarding an enemy ship, those Lieutenants of yours will be helpful, as they will aid you into battle.

Assassination isn't that simple now in this one. You will probably struggle going full stealth if you do not upgrade various Assassination skills in your tree as your Assassination's base damage sometimes might not be enough to 1-hit brutes or captains, or other high-ranked officers. The game is therefore telling you to be smart when choosing your talents...

Music was also one of the big strengths of this game in the series. It really puts you in the mood whenever you are fighting as a spartan. You will also have a lot of emotional moments at some point in time, and the music really plays a big part in that, which makes your adventure even more memorable.

As you progress through the story, there will be many Assassination targets that you will have to kill. As you kill some of them, you will get a clue which will lead you to the next target. Therefore, you will have to dig your way a lot, until you reach to the final target.

I'd say that this game in the series was a pretty big change, and Ubisoft still has room for progression, especially in enhancing the RPG elements. But to this day, this is one of the most impressive games I've played in terms of exploration. It's definitely worth playing, with full of excitement and worth playing again