Hoping to clear up my current hints a bit before I start adding more games.

21) On my "CD shelve" this game takes up nearly an entire row.

Hint 2: Not because the box is quite that large, but because there are several of them.

Hint 3: Most of the boxes are expansions.

Hint 4: It's not Sims game.

20) If the protagonist of this game had been playable in Smash Bros. they could have up to 4 different move sets.

Hint 2: 1 "base" and 3 transformations.

Hint 3: There are already character(s) in Smash Bros. that share a name with the particular protag.

Hint 4: This has been equivalent of a trick question, since this character technically is in Smash, only it's him from the previous entry, and thus he doesn't really have moves relating to this game.

19) While this game is in some ways a return to the basics for this series, the additions it makes to your arsenal are some of the more original.

Hint 2: Includes a new mad villain as well as the classic one.

18) Brings a new meaning to twin-stick controls.

Hint 2: It's not Brothers: A Tale of Two Sons, but control-wise there is a similarity.

Hint 3: You essentially control two characters who are bound by...

17) 2019 2020 2021 2022

Hint 2: Obviously the game has been previously released or it wouldn't be on my list, but these dates can be found on the game's website currently.

Hint 3: The dates are for the expanded version of this game which is coming in early 2022, promise.

Hoping to clear up my current hints a bit before I start adding more games.

21) On my "CD shelve" this game takes up nearly an entire row.

Hint 2: Not because the box is quite that large, but because there are several of them.

Hint 3: Most of the boxes are expansions.

Hint 4: It's not Sims game.

20) If the protagonist of this game had been playable in Smash Bros. they could have up to 4 different move sets.

Hint 2: 1 "base" and 3 transformations.

Hint 3: There are already character(s) in Smash Bros. that share a name with the particular protag.

Hint 4: This has been equivalent of a trick question, since this character technically is in Smash, only it's him from the previous entry, and thus he doesn't really have moves relating to this game.

19) While this game is in some ways a return to the basics for this series, the additions it makes to your arsenal are some of the more original.

Hint 2: Includes a new mad villain as well as the classic one.

18) Brings a new meaning to twin-stick controls.

Hint 2: It's not Brothers: A Tale of Two Sons, but control-wise there is a similarity.

Hint 3: You essentially control two characters who are bound by...

17) 2019 2020 2021 2022

Hint 2: Obviously the game has been previously released or it wouldn't be on my list, but these dates can be found on the game's website currently.

Hint 3: The dates are for the expanded version of this game which is coming in early 2022, promise.

Apparently I made this set of hints quite tricky, as both #19 and #18 went unguessed. Let's see if it can get a little easier with the next hints.

#17: The Mac OS version of this game (at least) featured an interesting anti-piracy measure where you had to look up letters in the manual.

Hint 2: Once you find the correct letter, you can drink the correct bottle and the door to the next level opens. Drink the wrong one, and die.

Hint 3: This actually mirrors the rest of the game, most bottles are for health, while some take health. You see this by the color of its plume. Obviously though there is no plume in the lettered bottles because that would be too easy to guess.

Hint 4: The levels start down in a grey-coloured dungeon, presumably the place where you were imprisoned, until the switch to the more elaborately decorated red and golden floors of the palace.

#14: Beach balls can roll on all sides.

20.  Hyrule Warriors: Age of Calamity

#23 This game was originally going to release with an entire province the player could explore but was cut and instead took place on an island within the province.

Hint #2 The setting is very unique compared to most games in the same genre.

#21 In this game you can fly around space and land on various moons.

Hint #2 In this game you have a special pair of boots that make traversal easier.