Sonic Boom - Part 04 - The Pit

The part that was skipped was opening the gate by the mines and being told to fix Salty's Boat.
There's a colour coded area Knuckles can dig into to search for one piece, another Knuckles digging area across some Ennerbeams/Springs and another across the water accesssed by using the slow spinning windmill like objects.
With the three parts Salty will repair the Riptide and you get a segment controlling the Riptide. Knuckles is the driver and Sonic/Tails/Amy control weapons. Amy's I barely ever used. Sonic was good for groups of smaller enemies/projectiles and Tails did the most damage to single larger targets.
This segment overstayed its welcome a bit, and I didn't thinl there were enough Rings, but at least each individual room was a checkpoint that respawned you with a few hitpoints worth of rings. So after a couple of deaths I was able to make it through. Swapping to Sonic's weapon helped a lot more.
When done you'll arrive outside of The Pit and have a running section and an Ennerbeam to arrive at the actual Pit section of The Pit.
Sonic and Knuckles is the first pairing. Use Sonic where possible as he's faster, obviously. He can still break those small rocks too. There's an Ennerbeam to pull and a Minecart to shove to reach another section where you lower the other side of the bridge and then drag the minecart across the mid section. You'll activate a large Robot and have to chuck robots at it to defeat it and fall down the hole it has been drilling.
You'll fight some shield guys, who are best handled by Ennerbeaming their shields off and then punch through a wall. Knuckles slaps Sonic and some rings come out, but weirld enough I have more Rings after the cutscene.
More Sonix platforming including freezing some lava and Ennerbeaming across and you'll have another small combat encounter before moving a platform to reach the next segment. A tougher robot appears, but you can quickly shove it into the lava.
Smash the rocks between the gears and then use the Spindash ball to access the tubes to the next area.
There's more puzzles with Sonic, including a Homing Attack one which feels like a beta for some of the Homing Attack puzzles in 2D sections of Forces.
Another small combat section and you can open up the route to find Amy and Tails. Then you'll find a giant mecha worm chasing you on a running section before you find the Crystal and then you have to defeat the Driller Worm boss. You defeat it by throwing robots into its mouth Ennerbeaming it to bring it down then attacking its eye. On the second and third hits you'll have to bounce enemies off the bounce pads to land in its mouth.
You leave with the crystal and see Eggman and Lyric plotting together.
Back in Cliff's Excavation Site head to Doc Ginger who will give you a side quest. I don't think I do it, but I think it involves those weird white flowers we saw in the early part of the game.
The Red Crystal Door is right by Doc Ginger but I spend ages trying to find it by going through the mine section until I loop back around. The part ends with me about to explore the new area.