SegaAge has been a bit slow recently, so I thought I'd start introducing some visual "guides" to some mini-sets in the collection. After completing my CIB Genesis set I started to go back and make all of my games 100% complete and thought this might be a good opportunity to share my knowledge.
So first up, Sega Club games for the Genesis. In total there are 9 games and one accessory (6 button controller).
I'll photograph each game and try to include a few notes/tips for each. Here is a list of the 9 games:
1) The Berenstain Bears' Camping Adventure (1994)
2) Bonkers (1994)
3) Crystal's Pony Tale (1994)
4) Ecco Jr. (1995)
5) Math Blaster: Episode 1 (1994)
6) Richard Scarry's Busytown (1994)
7) Scholastic's The Magic School Bus: Space Exploration Game (1995)
8) Sesame Street Counting Cafe (1994)
9) Wacky Worlds (1994)
1) The Berenstain Bears' Camping Adventure (1994)

Berenstain Bears includes a Sega Club registration card and a Sega Club fold-out poster. The clamshell is a standard Sega branded clamshell consistent with later releases.
2) Bonkers (1994)

Bonkers is a cardboard only release. The cardboard tray is the horizontal variety. Bonkers came with a Sega Club registration card and a Sega Club fold-out poster.
3) Crystal's Pony Tale (1994)

Crystal's Pony Tale includes a Sega Club registration card and a Sega Club fold-out poster. The clamshell is the same as the one for Berenstain Bears, a standard Sega branded clamshell consistent with later releases.
4) Ecco Jr. (1995)

My copy is sealed; however, the contents of this release are just a Sega Visions b-fold registration card (one side of the card says "Enclosed: Winner's Instruction Manual). The game is cardboard only. The cardboard tray is the vertical kind (ie not the same tray that Bonkers uses).
For Ecco Jr. is a title I long recommended buying new from Amazon.com . Up until very recently there were sealed copies for $35 shipped or less, though those appear to have finally dried up as that is now the CIB price of the game. I was typing this guide expecting to link you guys, but that boat has sailed haha, I guess I put off too long buying additional copies.
5) Math Blaster: Episode 1 (1994)

My copy of Math Blaster is also sealed. Math Blaster includes a Math Blaster poster.
The game may also include a Davidson registration card. A long time ago there was a cart+box copy on eBay that had a Davidson registration card. I waited about a year but never saw another copy with that registration card; Math Blaster is the only Davidson release for the Genesis. In the end I bought a sealed copy because I wasn't sure.
6) Richard Scarry's Busytown (1994)

Richard Scarry includes a Sega Club registration card and a Sega Club fold-out poster. Richard Scarry is a cardboard only release and the cardboard tray is the horizontal variety (same as Bonkers).
7) Scholastic's The Magic School Bus: Space Exploration Game (1995)

Like Ecco Jr., Magic School Bus just includes a Sega Visions b-fold registration card. As pictured, the cardboard tray for Magic School Bus is vertical.
8) Sesame Street Counting Cafe (1994)

Sesame Street is an EA Games release. The plastic clamshell does not have a hangtab. I am not sure which inserts this game includes, but if I remember correctly they are EA inserts and not the Sega ones that have been included in all of the other Sega Club games. There is at least an EA games registration card and anywhere from 1 to 3 other inserts. I bought my copy sealed due to the uncertainty.
9) Wacky Worlds (1994)

My copy is sealed but I recently sold a CIB copy. The copy that I sold included a Sega Club fold-out poster, an instruction card for the Mega Mouse, the Mega Mouse accessory, and a red Mouse Pad (no markings or logos). There is a chance that his game also included a Sega Club registration card, as that would be consistent with every other game that had the Sega Club fold-out poster.
For Wacky Worlds there is still (as of September 12) a new copy on Amazon for $39.99 + $6.10 shipping, which honestly is a pretty good deal.
After the 9 games there is one Sega Club branded accessory, a six-button controller. The controller is smaller for smaller hands.

There are 4 inserts for the Sega Club six-button controller: Sega Club registration card, Sega Club fold-out poster, six-button controller instruction card, and a Mega Mouse advertisement.
Hopefully these pictures are descriptions are helpful. If there are any suggestions let me know! I'm glad to answer any questions and I'll try to put together similar kinds of posts for those working on their CIB collections.