How can you get to chapter 23, we are stuck.?

I assume you mean you are stuck in Chapter 22. Nothing superspecial in the lair. It just looks especially menacing. Some of the new tricks, include: In the path of fangs, stay to the side of the path. In the middle you get hit and killed a LOT. At the edge or side of the path, the scorpion stingers will miss you. When collecting stuff, you can get the stuff from only one side of the path per PAIR of storage areas. As soon as you enter one side, the other LOCKS. SO pick the side WITH the treasure, scrolls, gems, etc. Are stored to complete your "collection", otherwise it will take you two (or more) passes to complete the Lair of Kaos. It may take you two anyway. This may be one of those levels that it is simply NOT POSSIBLE to complete it in a single pass.

At one point you come to a triple keyed gate. The first key is easy to find, the next two are harder. You must get on the small round platforms that APPEAR to be empty "dead ends". They are NOT. Go into the area and stand to the side between the scorpion stingers or you will stung. Just stand there, the little round areas, will float away from the main pathway. Don't worry, just let them float, Each will float to a new location within Kaos' Lair where you must defeat more enemies to retrieve the next KEY. Those new areas also hold treasures, gems, hats or whatever you might be missing from the collection and objectives. You will have to do BOTH those floating gizmos to collect all three keys. Once you unlock the triple keyed gate. Keep working your way further and further. There are the usual assortment of skull and crossbones dragon gates you can't get past until you kill all the enemies. There are several requiring Keys. If you have made it this far, you know how to kill enemies and search for stuff. The spinning blade area also has a spinning floor below each spinning blade, Some of the floor have jump pads. You need those to retrieve the booty hovering in the air. Once you complete the Lair, the game will take you to Kaos' Castle for the final fight. The LAIR is hard but NOT impossible. I won't even say the Lair of Kaos was the hardest chapter I have done. Some of the others gave me way more trouble. BUT the Lair IS TOUGH! You simply have to be methodical and work the area just like any other. Don't be surprised if it takes you two or three tries. Remember, you don't HAVE TO collect everything in order to complete the level. You can always make one pass to "learn the lay of the land". A second and third and .... To collect the treasure etc. Then make another pass to actually FINISH the "Lair" chapter.

After this you only have Castle Blackthorne (the final fight with Kaos) and you will have completed all the levels that originally came with the game.

You MAY (if you have the REAL MONEY from the REAL WORLD) purchase the four adventure packs, which will extend the game.

Of course you can always play everthing again using a NEW fresh game. You can also do all the Heroic Challenges. I have completed ALL the levels including all four adventure packs. I have ALL the stars. I have collected EVERTYING and I am still only at 67% complete. Next comes all the Heroic Challenges. I have tried a few they are TIMED and "way tough". Took me about 10 tries with my fastest flying skylander to get through one of them. So even after defeating Kaos, there is still a LOT to do.