Cosmic Heart Zone
@cosmicheartzone.bsky.social
(Sonic Alternate Universe Ask Blog)
A look at a What if scenario where Tails and Cosmo first met in the main series/canon games as far back as the first Sonic Adventure!
A look at a What if scenario where Tails and Cosmo first met in the main series/canon games as far back as the first Sonic Adventure!
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COSMIC HEART ZONE TIMELINE INDEX
This is just an index that'll list each game within the timeframe of this Alternate Universe starting with Sonic Adventure all to the way to the most recent Sonic game. This will be updated as more a…
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www.tumblr.com/cosmicheartz... Index of most Cosmic Heart Zone posts! (Updated whenever a post relates to a certain game from Sonic Adventure 1 to whatever is the most recent Sonic game)
www.tumblr.com/cosmicheartz... CHZ: Pac-Man Festival
Post by @cosmicheartzone · 4 images
💬 0 🔁 0 ❤️ 2 · ((A wholesome conversation with a gaming icon!))
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January 10, 2026 at 8:01 PM
www.tumblr.com/cosmicheartz... CHZ: Pac-Man Festival
www.tumblr.com/cosmicheartz... CHZ: Cosmo's Rival Interactions - Team Eggman
Post by @cosmicheartzone · 8 images
💬 0 🔁 0 ❤️ 0 · ((At last all the base game characters now have their rival interactions with Cosmo on CHZ! Thank you for being patient as I built up to this one over the course of a month and a h…
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January 1, 2026 at 5:17 PM
www.tumblr.com/cosmicheartz... CHZ: Cosmo's Rival Interactions - Team Eggman
www.tumblr.com/cosmicheartz... CHZ: The Long Game
Post by @cosmicheartzone · 3 images
💬 0 🔁 0 ❤️ 0 · ((Coming next: the Cosmo rival interactions for Team Eggman at last!))
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December 30, 2025 at 6:54 PM
www.tumblr.com/cosmicheartz... CHZ: The Long Game
www.tumblr.com/cosmicheartz... CHZ: Cosmo Finishes Those Errands
Post by @cosmicheartzone · 4 images
💬 0 🔁 1 ❤️ 2 · ((Cosmo's finally back from her errands, you could say, in Bikini Bottom. Telling Tails some of what she saw there along with mentioning the inclusion of NiGHTS to tie in to their…
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December 24, 2025 at 7:43 PM
www.tumblr.com/cosmicheartz... CHZ: Cosmo Finishes Those Errands
www.tumblr.com/cosmicheartz... CHZ: Sage's Intentions (Part 4/End)
Post by @cosmicheartzone · 4 images
💬 0 🔁 0 ❤️ 0 · ((Sage sprites by minuluv73))
Tails: Well I guess we finally know where Sage will stand after the Starfall Islands. Cosmo’s going to be quite upset though… but I’m sure she’ll con…
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December 20, 2025 at 11:38 PM
www.tumblr.com/cosmicheartz... CHZ: Sage's Intentions (Part 4/End)
www.tumblr.com/cosmicheartz... CHZ: Sage's Intentions (Part 3)
Post by @cosmicheartzone · 5 images
💬 0 🔁 0 ❤️ 1 · ((Sage sprites by minuluv73))
((For the record, Sage would certainly be able to RUN Doom in all likelihood, ha.
Also a slight dig at Sonic Rumble. I've been casually playing it b…
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December 14, 2025 at 12:08 AM
www.tumblr.com/cosmicheartz... CHZ: Sage's Intentions (Part 3)
www.tumblr.com/cosmicheartz... CHZ: Sage's Intentions (Part 2)
Post by @cosmicheartzone · 5 images
💬 0 🔁 0 ❤️ 1 · ((Sage sprites by minuluv73))
Tails: Gaaah! That only makes me want to know what Ozzie said MORE!
Sage: As the Heart of the Eggman Empire, it's kinder this way~
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December 8, 2025 at 5:19 PM
www.tumblr.com/cosmicheartz... CHZ: Sage's Intentions (Part 2)
www.tumblr.com/cosmicheartz... CHZ: Sage's Intentions (Part 1)
Post by @cosmicheartzone · 2 images
💬 0 🔁 0 ❤️ 1 · ((Sage sprites by minuluv73))
((Just wanted to give a little more time for people to send in questions for Sage. Got a few good ones already but this shouldn't be a month-long que…
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December 3, 2025 at 7:52 PM
www.tumblr.com/cosmicheartz... CHZ: Sage's Intentions (Part 1)
www.tumblr.com/cosmicheartz... CHZ: Sage-mail
Post by @cosmicheartzone · 2 images
💬 0 🔁 0 ❤️ 0 · ((Sage sprite by minuluv73))
((This is why Team Eggman was made to wait for the Cosmo rival interactions series, Sage hadn't even made a proper appearance on CHZ yet! As for what…
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November 30, 2025 at 6:29 PM
www.tumblr.com/cosmicheartz... CHZ: Sage-mail
www.tumblr.com/cosmicheartz... CHZ: Spongebob Festival
Post by @cosmicheartzone · 4 images
💬 0 🔁 0 ❤️ 1 · ((Spongebob, Patrick, and Squidward ripped by Rockman64 and LuigiRules 2009 from the Atlantis Squarepantis game))
Cosmo: I do have one more concern for you two though. You’re unde…
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November 28, 2025 at 5:43 PM
www.tumblr.com/cosmicheartz... CHZ: Spongebob Festival
Reposted by Cosmic Heart Zone
Made 3 Sonic related machines in Kirby Air Riders today! Cosmo, Tails, and the Blue Typhoon! #kirby #kirbyairriders #kirbyairride #tails #cosmotheseedrian #sonicthehedgehog #sonicx #tailsmo
November 25, 2025 at 9:51 PM
Made 3 Sonic related machines in Kirby Air Riders today! Cosmo, Tails, and the Blue Typhoon! #kirby #kirbyairriders #kirbyairride #tails #cosmotheseedrian #sonicthehedgehog #sonicx #tailsmo
www.tumblr.com/cosmicheartz... CHZ: Tails' Birthday Traditions
Post by @cosmicheartzone · 1 image
💬 0 🔁 0 ❤️ 0 · ((Yes I’m aware that for some Tails’ birthday is in October because that’s when the Game Gear/Master System version came out. Though I personally prefer to see the Genesis Sonic 2’…
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November 20, 2025 at 7:42 PM
www.tumblr.com/cosmicheartz... CHZ: Tails' Birthday Traditions
www.tumblr.com/cosmicheartz... CHZ: Kuku Empire and the Witchcarters
Post by @cosmicheartzone · 1 image
💬 0 🔁 0 ❤️ 0 · Tails: By now I have told Cosmo all about my past adventures before I met her. She appreciated hearing about all the small animals we rescued as well as keeping many natural forest…
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November 15, 2025 at 11:07 PM
www.tumblr.com/cosmicheartz... CHZ: Kuku Empire and the Witchcarters
www.tumblr.com/cosmicheartz... CHZ: Cosmic Shake Up
Post by @cosmicheartzone · 3 images
💬 0 🔁 0 ❤️ 1 · ((Tails will be on his own for a little bit while Cosmo fetches the next addition of racers. With Cosmo being the best choice to greet them given she can stay underwater longer the…
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November 12, 2025 at 8:12 PM
www.tumblr.com/cosmicheartz... CHZ: Cosmic Shake Up
www.tumblr.com/cosmicheartz... CHZ: Cosmo's Rival Interactions - Team Zeti/Deadly Six
Post by @cosmicheartzone · 4 images
💬 0 🔁 0 ❤️ 3 · ((Cosmo isn't exactly fond of the inclusion of Zavok or Zazz either. Just as many fans were, heh. Nonetheless, it did give a chance for them to get roasted by much of the cast. (Ev…
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November 8, 2025 at 7:30 PM
www.tumblr.com/cosmicheartz... CHZ: Cosmo's Rival Interactions - Team Zeti/Deadly Six
www.tumblr.com/cosmicheartz... CHZ: Cosmo's Rival Interactions - Babylon Rogues
Post by @cosmicheartzone · 6 images
💬 0 🔁 0 ❤️ 0 · ((Extreme gear/hoverboards was a past time that Cosmo had already learned while traveling with her sister. So in the original Riders for the CHZ timeline, it was her that helped Te…
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November 3, 2025 at 7:27 PM
www.tumblr.com/cosmicheartz... CHZ: Cosmo's Rival Interactions - Babylon Rogues
www.tumblr.com/cosmicheartz... CHZ: Cosmic the Hedgehog
Post by @cosmicheartzone · 1 image
💬 0 🔁 0 ❤️ 1 · ((Happy halloween!
This uh... rather cursed fusion between Sonic and Cosmo comes from the Sonic Adventure 2 Cosmo over Sonic mod. It's what you see when you watch most of the cuts…
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October 31, 2025 at 4:48 PM
www.tumblr.com/cosmicheartz... CHZ: Cosmic the Hedgehog
www.tumblr.com/cosmicheartz... CHZ: Cosmo's Rival Interactions - Team Dimensions
Post by @cosmicheartzone · 4 images
💬 0 🔁 0 ❤️ 1 · ((Until now I've been doing the teams in the order you race them in Race Park. But let's just say, I want to save Team Eggman for last for a special reason.
Anyhow, with Silver he…
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October 29, 2025 at 8:42 PM
www.tumblr.com/cosmicheartz... CHZ: Cosmo's Rival Interactions - Team Dimensions
www.tumblr.com/cosmicheartz... CHZ: Joker Festival
Post by @cosmicheartzone · 3 images
💬 0 🔁 0 ❤️ 0 · Tails: Sonic tried asking about getting me there for the 4th one, doubled his efforts for the most recent one. And he told me he’ll triple his efforts and then some for the next on…
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October 26, 2025 at 9:20 PM
www.tumblr.com/cosmicheartz... CHZ: Joker Festival
www.tumblr.com/cosmicheartz... CHZ: Cosmo's Rival Interactions - Team Chaotix
Post by @cosmicheartzone · 6 images
💬 0 🔁 0 ❤️ 0 · ((Now all four of the Sonic Heroes teams are finished!
Just like in the X Universe, the Chaotix tried to get Tails and Cosmo closer while they were still just friends. So the both…
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October 21, 2025 at 6:04 PM
www.tumblr.com/cosmicheartz... CHZ: Cosmo's Rival Interactions - Team Chaotix
www.tumblr.com/cosmicheartz... CHZ: Cosmo's Favorite Crossworlds Course
Post by @cosmicheartzone · 1 image
💬 0 🔁 0 ❤️ 3 · Cosmo: While Rainbow Garden is my clear favorite. I do like a few other tracks as well! I like to shop with Amy, so we certainly have plans to go through the Colorful Mall. And the…
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October 19, 2025 at 9:18 PM
www.tumblr.com/cosmicheartz... CHZ: Cosmo's Favorite Crossworlds Course
www.tumblr.com/cosmicheartz... CHZ: Cosmo's Rival Interactions - Team Dark
Post by @cosmicheartzone · 6 images
💬 0 🔁 0 ❤️ 1 · ((Team Dark's turn this time. I've noted people seem to be enjoying these, to the point of a decent jump of new followers. And with new followers, comes a bit of possible confusion…
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October 14, 2025 at 4:08 PM
www.tumblr.com/cosmicheartz... CHZ: Cosmo's Rival Interactions - Team Dark
Reposted by Cosmic Heart Zone
It has been a long and challenging journey but we are thrilled to announce that... SONIC RIDERS FUTURE VOL. 1 IS OFFICIALLY HERE! 👀
drive.google.com/file/d/1U5u-...
We’re excited to see what the FUTURE holds for all of us.
Alright Riders, let's RIDE into the FUTURE! 🏂
#Sonic #SonicRiders
drive.google.com/file/d/1U5u-...
We’re excited to see what the FUTURE holds for all of us.
Alright Riders, let's RIDE into the FUTURE! 🏂
#Sonic #SonicRiders
October 11, 2025 at 1:58 AM
It has been a long and challenging journey but we are thrilled to announce that... SONIC RIDERS FUTURE VOL. 1 IS OFFICIALLY HERE! 👀
drive.google.com/file/d/1U5u-...
We’re excited to see what the FUTURE holds for all of us.
Alright Riders, let's RIDE into the FUTURE! 🏂
#Sonic #SonicRiders
drive.google.com/file/d/1U5u-...
We’re excited to see what the FUTURE holds for all of us.
Alright Riders, let's RIDE into the FUTURE! 🏂
#Sonic #SonicRiders
www.tumblr.com/cosmicheartz...
CHZ: Minecraft Festival
CHZ: Minecraft Festival
Post by @cosmicheartzone · 6 images
💬 0 🔁 0 ❤️ 1 ·
Tails: Definitely wasn't wise of Steve to startle Cosmo like that…
((Whew, another festival in Crossworlds already? Didn't quite expect them to come quite this quickly. Good cha…
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October 9, 2025 at 10:57 PM
www.tumblr.com/cosmicheartz...
CHZ: Minecraft Festival
CHZ: Minecraft Festival
www.tumblr.com/cosmicheartz... CHZ: Cosmo's RIval Interactions - Team Rose
Post by @cosmicheartzone · 6 images
💬 0 🔁 0 ❤️ 2 · ((Team Rose this time! Reminder of course that while Cosmo replaced Big in Sonic Heroes in the CHZ timeline. The girls still consider him an honorary member. Also Team Eggman havin…
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October 7, 2025 at 4:14 PM
www.tumblr.com/cosmicheartz... CHZ: Cosmo's RIval Interactions - Team Rose