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In Revenge of the Savage Planet, everything is bigger than what came before. That’s the goal of all corporations, to swell so large that they encompass the whole universe. Sure, you might lose your job, but that’s the price to pay for a good time. The game gives you a journey all the way to a new star system, what a reward!
With four whole planets to explore, you won’t be wanting for more than that. Oh, you do want more? Well aren’t you lucky because in the 100 years since they put you into cryo-sleep, a whole new planet has appeared. It is, however, more secretive than all the others, and can’t be accessed until near the end of the game.

What Is The Secret Planet?
This secret planet can be seenon the planet map from the very beginning of the game, though you would have no way of knowing it’s a secret until, well, you don’t unlock it normally. Rather than being a large planet like all the others, it is a constructed location, a space base in an otherwise uncharted star system. So how does that make sense?
You might have noticed in your Habitat back on Stellaris Prime the empty Slappi box beside the TV. Well, it just so happens that Slappi is the next closest thing to sentient in this part of space, and he has been here a lot longer than you. An extra 100 years, in fact. Plenty of time to build his own home.

And that is our final, secretive planet.Slappi’s Den of Fun.A wonderfully happy name. But what exactly is awaiting you there?
How To Unlock Slappi’s Den of Fun
While he tries his very best to hide his identity, Slappi is very poor at subterfuge. Throughout the game he will contact you,leading you towards his shrinesas a means of testing your skills. Completing each of these shrines will grant you an artefact, a piece ofthe Pentaforce. As the name implies, there are five of these to collect in total.
As such, that means there arefive shrinesin total, too. They are in the following locations:

The very last one is locked behind story progression, thoughthe remaining four can be found as soon as you have unlocked the respective abilitiesneeded to access them. Once you have gathered every piece of the Pentaforce, it can be researched back at the Habitat. Upon completion of this research, you will finally unlock your final planet - Slappi’s Den of Fun.
Is Slappi’s Den Of Fun A Full Planet?
On the Planetary Chart,you can see Slappi’s Den of Fun as the smallest planeton it, and by a considerable degree. It would seem to be similar in size to Xephyr, though it is considerably smaller than that still. You see, Slappi’s Den of Fun is actually a completely linear planet, more in line with his Shrines you completed to get here, rather than the whole planets on which you found them.
Slappi’s Den of Fun is the true last planet of the game, and where you will get the full extent of the story. Slappi has plenty of his own grievances built up over the last century, and you’re the only one he can take them out on.The very last boss fight of the game is found here, too, so come prepared with plenty of upgrades.