CIT wrote:Sega Ages Vol. 29: Monster World Complete Collection
Sega Ages Vol. 32: Phantasy Star Complete Collection
Sega Ages Vol. 33: Fantasy Zone Complete Collection
Oretachi Ge-sen Zoku: Akumajo Dracula
Oretachi Ge-sen Zoku: Contra
Oretachi Ge-sen Zoku: Thunder Cross
Those are some that I was going to mention. The Oretachi Geasen Zoku series doesn't get enough recognition.
Vol.17 Pooyan is very enjoyable, especially with the option to play in tate mode. Of course Contra offers that option as well.
And, Vol.4 Time Pilot is the best home version available, also displayable in tate mode.
In the SegaAges collection I'll add to those mentioned already: Vol.21 SDI & Quartet Sega System 16 Collection, and Vol.26 Dynamite Deka are not to be missed. I particularly like having Vol.23 Memorial Collection and Vol.15 Decathelete as well.
For the GunCon2, Gunvari Collection + Time Crisis is more fun than one person can handle.
And an odd-ball, and not-entirely exclusive, Sega/Wavemaster's port of Switch will have you grinning and scratching your head.