To me the criteria of being an Adventure game is having multiple playable characters but only one at a time, and a Chao Garden. Sonic Heroes had the team gimmick, Shadow had guns and only let you play as Shadow (aside from 2P), Sonic 06 is the closest to being an Adventure game out of all of those but shouldn’t count because it was only about 70% finished at release, and Unleashed was another gimmick game and even the regular Sonic gameplay was completely different. I wish people wouldn’t be like, “Sonic 06 was bad so they should never attempt the Adventure style gameplay again”. Sonic 06 was bad because it was unfinished and buggy, and story aside I really believe Sonic 06 would’ve been considered a good game had it had an extra year of dev time to iron out all of the bugs and include all of the content originally planned. I’d love to see something like Sonic 06 but polished to the max, and maybe some major changes to the story to make it less cringy.