Thank you. On a side note, I can't even find Lego Dimensions on Best Buy's website.
Tried clearing my cache and still nothing. I was hoping to check my local Best Buy for whatever is left of Lego Dimensions. Also, to find out if the price was the same, as the clearance price on Best Buy's online store.
No problem. Unlike Skylanders, where you just had to scan a level piece once (my son unlock all the levels for my neighbor's game, and he could permanently use them from then on for that save file) - Dimensions actually integrated the figures (and the included items) into the level design. If you don't have Chell and the Companion Cube, you aren't going to finish the Portal level, for example - you can get to it without her once it is unlocked, but you will get stuck by some of the puzzles required to proceed. You can hobble by on some of them with other character combinations, but it is a pain to figure it all out.
Each of the stories, main game and level packs only require the figures and items that come with them to complete but you will have bricks you can't get. At various points they will force you to make the included items for progression (but you can cancel and use something else that can accomplish that ability, if you have it). The only real flaw in all of this is the Midway Arcade pack, as some of the playable games are only unlocked in other level packs. You have to have three other level packs to unlock all of the content from the Midway Arcade pack.
Now, you can unlock themed figure's Free Play worlds, and there is stuff to do in those, so it isn't a total wash to use a friend's figures. In fact many of those require "visiting" characters to get some bricks, for example the Harry Potter world has a brick locked behind Supergirl's unique "Red Lantern" ability. Also, some puzzles require a combination of abilities that only certain characters can do, like Aquaman who has the ability to go underwater AND operate certain puzzles, which is necessary at least for a few bricks.
Also, conversely, some figures make some challenges ridiculously easy. For example, some require you to run fast - and early on to do that you had to use Arcade Kid - which has a lead up where he drinks a soda that makes him fast. And you had to re-do it a few times making it tough to keep up. But Sonic just runs really fast all the time, making that challenge laughably trivial.
The main thing is, you have to be happy with what you can do and not worry about collecting every brick, because without a full roster covering all abilities (and that list is substantial) some bricks will simply be out of reach. Which isn't a big deal unless you are OCD, as there is a TON to do.