There was no collected edition of the Shakespeare's plays during Shakespeare's lifetime.
The first collected works of Shakespeare was the First Folio [1623] put together by Shakespeare's colleagues Hemmings and Condell some seven years after William died.
There are clear indications in the arrangement and printing of the First Folio that at least one play (Cymbeline) was included at the last minute - this suggests that Hemmings and Condell probably had access to only some of the plays, and got hold of Cymbeline only after the main printing plan was already decided.
There was a Second Folio in 1632, and a Third in 1664. The Third Folio included six new plays - five of them are almost certainly not by Shakespeare, but Pericles very probably is.
Given that the publishing history is so untidy, there is every chance that there are still some plays by Shakespeare that never got into any of the Folios. In recent years scholars have decided that Two Noble Kinsman is at least partly by Shakespeare.
Shakespeare seems never to have been very interested in publishing his plays - he wrote them for performance, not for reading. There are possibly 3. The main one is Cardenio, but there is also reference to "love's labours wonne" which could be a sequel to 'love's labours lost'. Lastly there is a 'ur-hamlet' a version of hamlet that was around at least a decade before shakespeare wrote the hamlet we know today. This may be written by Shakespeare, or another playwright of the time
Both Titus Andronicus and Henry VI Part II were published in 1594.
Cardenio appears never to have been published. This was a late play, based on Don Quixote by Cervantes. Love's Labour's Won, the sequel to Love's Labour's Lost, also does not exist in published form, although some scholars believe that it may have been renamed as one of the plays we know.
The play Macbeth alludes to the Plot
Ophelia
Shakespeares "Othello"
hamlet
The audience
Hamlet is the most performed play. As far as I know, none have been prefoomed.
Shakespeare's play that starts with three L's is Love's Labour's Lost. It is under the genre of comedy and was written in 1594.
Posthumous. This means "after death". All of Shakespeare's poetry which was published at all was first published when he was alive. The same cannot be said of the plays. Some sixteen or seventeen of the plays, including such well-known ones as Macbeth, Julius Caesar, The Tempest and As You Like It were first published in the omnibus volume known as the First Folio in 1623, seven years after Shakespeare's death. One play was first published in 1634 as a separate publication. Of course the plays had been performed many times and were well known before Shakespeare died, but they had not been published.
Julius Caesar
Romeo & Juliet