In order to have the best experience with the continuity to Steins;Gate 0, you should watch up to Episode 22 through the very end of the credits, then move to Steins;Gate: Kyoukaimenjou no Missing Link - Divide By Zero. See my note below, in that episode.
Why Watch Steins;Gate?
This show starts slow the main plot only starts to develop around episode 7 but be patient, is well worth it and make no mistake, these first episodes are necessary to introduce the characters and without them, the emotional impact won't be the same (TuTuRu). Once the main plot starts you won't have time to think of anything else than how to solve the impossible puzzle they get into and very quickly it changes from a light-hearted series to a dark thriller.
This is a genius plot, the writers really consider time travel thoroughly and were able to create a new fresh take on this popular sci-fi sub-genre. The sequel is just as good.
“If you relish the idea of a gripping and thought-provoking anime, set against a mysterious and ominous backdrop, and spiced with humor and emotional moments, you could not go wrong in watching Steins;Gate.”
Steins;Gate is perfect. It is the epitome of psychology, the embodiment of intrigue, and the quintessence of written art. It stands above all anime which have come before it. It excels. It micrifies all of its predecessors in all mediums, be they novels, manga, anime, or films. It radiates brilliance... Those who experience Steins;Gate reach a level of existence beyond that of anyone else. To not watch it is to be missing an aspect of your life. The story of Steins;Gate commands your attention by the sheer authority of its breathtaking development...
The plot of Steins;Gate is well thought out, creative, and captivating. Intrigue pulls you into the plot of Steins;Gate, and as you continue watching, you yearn to know what happens next as choices are made and mysteries dazzlingly unraveled. While some revelations are not hard to guess at beforehand, others leave you speechless. I have had several chills run down my back as I learn some of the amazing truths behind the original surface of the plot, whether the identities of certain characters, or the reasons for certain events. That being said, I'm also glad at where the author did not choose to leave the viewer guessing. For example, right from the start of the anime, you know who the enemy (organization) is. Also, it does not take long before the characters clearly learn how to achieve certain feats. But because of this, you end up wondering 'what will the characters do with this? How will they escape the enemy?' These types of questions, though they don't leave you looking for hints or decrypting riddles, are mysteries of their own, and they keep you clicking 'next' after every episode.
...Anime with choices to be made. Consequences for those choices. Themes running through actions. Steins;Gate excels in all of these areas; and it should, since the plot is built on a concept fraught with consequences - time travel. Nearly every episode in Steins;Gate, there are choices to be made. At first, choices are made quite easily, and great joy comes from the characters' actions. As the plot progresses, however, consequences begin to appear, and we learn that nothing is as simple as it seems... The butterfly's wings are flapping.
The characters of Steins;Gate are fantastically creative and compelling. Several of them seem, at first glance, to exemplify certain anime stereotypes. But as you experience more of the story, you get to watch the actions of these characters, hear their opinions and thoughts, and realize that for each of them, there is more going on than meets the eye... On the lighter side, all the characters are also really entertaining. Despite the overall serious nature of the anime...
The plot of Steins;Gate is well thought out, creative, and captivating. The themes are deep and the choices complex and sometimes painful. The characters are entertaining and fascinating. The sound and animation suit the anime well and make it more amazing. If you relish the idea of a gripping and thought-provoking anime, set against a mysterious and ominous backdrop, and spiced with humor and emotional moments, you could not go wrong in watching Steins;Gate.' -sunnyloop
The dub is awesome! However, some dubs don't translate the text messages which are really important to the plot, make sure you watch one that does it if you prefer dubs.
Watch after Episodes 22 of Season 1. Make sure you watch all the way to the end of the credits.
The original Steins;Gate may have never become the classic is today without a proper ending, however, (I'll be vague here in order to avoid spoilers) the events leading to the end happen rather quickly and their emotions seem a little superficial considering everything that has been going on, furthermore, some timelines are left unexplained. To fix all that watch this episode and then continue to Steins;Gate 0, before finishing watching episodes 23-24 of Season 1.
Continuation of the timeline from Divide by Zero (Episode 23b).
Watch the whole season, then finish with episodes 23-24 from Season 1.
Optional. (Aka Episode 25 of Season 1) is ok, not great. It provides a hint for how they met the Part-Time Warrior's Mother and some closure for the main protagonists' relationship, but it's also like 90% filler fluff, so it's up to you if you watch.
Optional. Although is considered canon is just an ok movie that reuses the plot, reversing some of the character's roles and focuses more on the romantic aspects from the show. The sci-fi aspects of the plot and thrills are weak, to say the least, so there is little to be gain from watching this in my opinion but a lot of people likes it just for the romance alone.
The events of this movie are set after the final from Season 1 and after Egoistic Poriomania.
Skip. It's just filler fluff slice-of-life.