Grandma is a character mentioned in  and Sonic Adventure . She was the former leader of the Sonic Adventure DX: Director's Cut Knuckles Clan, the mother of Pachacamac and Tikal's grandmother.
The former leader of the
Knuckles Clan, Grandma lead her small country down a passive path. Well-versed in her clan's legends surrounding the  Chao, the Master Emerald and the Chaos Emeralds, Grandma would raise her granddaughter Tikal and pass her knowledge onto her, including an old mantra. Grandma's teachings likewise instilled strong pacifistic beliefs in Tikal who loved her grandmother dearly. 
When Grandma passed away,
Pachacamac took over and directed their clan into a series of violent conquests of the neighboring countries.
Pachacamac, Grandma held strong peaceful beliefs that she would instill in Tikal. She similarly lacked her successor's ambition for conquest, as the Knuckles Clan's country was much smaller during her reign.
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Sonic Team (October 19, 1999). Sonic Adventure. Dreamcast. Sega. Area/Level: Mystic Ruins ( Tails' version). " Knuckles Clan tribesman": The Chief's daughter loved her grandmother so much. The country was a lot smaller back when Grandma was alive. But the Chief wanted to expand his kingdom. After Grandma's death, he made his move... He did well. He quickly took over the surrounding areas. But his daughter didn't like what he'd done..."
↑ Sonic Team (October 19, 1999). Sonic Adventure. Dreamcast. Sega. Area/Level: Mystic Ruins (Tails' version). "
Tikal": Tikal: The servers are the 7 Chaos Emeralds. Hello there, friend. How are you? / ... / Tikal: Huh? It's something my grandmother taught me. I never to forget it. It goes like this... "The servers are the 7 Chaos. Chaos is power... Power enriched by the heart. The controller is the one that unifies the Chaos." But I'm still not sure what it all means. But the number 7...is the same as the number of Emeralds there are. "
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Sonic ( Super Sonic) | Tails | Knuckles | Amy | E-102 Gamma | Big | Metal Sonic*
Dr. Eggman | Beta ( Mark II) | Chao | Chaos ( Chaos 1, Chaos 2, Chaos 4, Chaos 6, Perfect Chaos) | Cream* | Delta | Epsilon | Froggy | Grandma | Mr. Know-It-All | NiGHTS | Pachacamac | Tikal | Unnamed Sonic robot* | ZERO | Zeta | Animals ( Deer, Elephant, Gorilla, Kangaroo, Koala, Lion, Mole, Parrot, Peacock, Penguin, Rabbit, Robin, Seal, Sea Otter, Skunk)
Adventure Fields Egg Carrier | Mystic Ruins | Station Square
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Beat | Bladed Spinner | Boa-Boa | Buyoon | Cart Kiki | Cop Speeder | Egg Keeper | Electro Spinner | Fighter Aircraft A | Fighter Aircraft B | Gola | Ice Ball | Icecap's unnamed aircraft | Kiki | Leon | mechanical fish | Pirate | Rhinotank | Sky Deck's unnamed jet fighter | Spiky Spinner | Sweeper
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Bolt of lightning | Climb | Dig | Flight Mode | Glide | Hammer Attack | Hammer Jump | Hover | Homing Attack | Homing Missile Launch | Jump Attack | Laser Gun | Light Speed Attack | Light Speed Dash | Lure Attack | Maximum Heat Knuckles Attack | Pick | Propeller Flight | Punch Attack | Rapid Tails Attack | Spin Dash | Spin Hammer Attack | Spin Jump | Tails Attack
Arm Punch | Bomb Attack | Bomb Gun Attack | Charge | Double Punch | Earthquake Attack | Electric Arm | Energy Ball Attack | Flame Thrower Attack | Guiding Missiles | Instantaneous Liquefaction | Laser Beam Attack | Homing Tail Slice | Inhale Attack | Marble Attack | Phantom Shadow Move | Punch | Quarter Attack | Scorpion Attack | Shockwave Attack ( Chaos 6) | Sonic Boom | Spin Attack | Spinning Spike Attack | Spouting Attack | Squash Roll Attack | Swing Punch
Gimmicks and obstacles
Bumper | Bumper Car | Cannon | Capsule | Conveyor Belt | Crank | Dash Panel | Dash Ring | Drum Can | Explosion Trap | Fan | Flipper | Fountain | Goal Balloon | Hanging Bell | Helicopter | Hint Box | Hint Orb | Icicle | Iron ball | Jump Panel (plate) | Jump Panel (ramp) | Jump Ramp | Laser field | Lit Panel | Mirror | Monkey Detonation Switch | Orca | Point Marker | Power cube | Rocket | Satellite | Slot machine | Spiked bar | Spring | Spring Catapult | Switch | Teleporter | Wide spring | Wind Path | Zip Line
Air Bubble | Cart pass | Chao Egg | Chaos Emerald | Doll | Emblem | Emerald Shard | Employee ID Card | Item Box ( 5 Rings, 10 Rings, Extra Life, High-Speed Shoes, Invincibility, Magnetic Shield, Random Rings, Shield, Smart Bomb) | Key Stone ( Gold statue, Ice Stone, Silver statue, Wind Stone) | Ring | Sandboard | Snowboard | Sonic Token
Level Up Items Ancient Light | Crystal Ring | Fighting Gloves | Jet Anklet | Jet Booster | Laser Blaster | Life Belt | Light Speed Shoes | Long Hammer | Lure | Power Rod | Rhythm Badge | Shovel Claw | Warrior Feather
English voice actors
Ryan Drummond ( | Sonic) Corey Bringas ( | Tails) Michael McGaharn ( | Knuckles) Deem Bristow ( | Eggman) Jennifer Douillard ( | Amy) Jon St. John ( | Big) Elara Distler ( | Tikal, Station Square Train Voice, Default Menu Voice) Steve Broadie ( | Gamma, Pachacamac, Mystic Ruins Train Voice) Tomoko Sasaki (
Japanese voice actors
Jun'ichi Kanemaru ( | Sonic) Kazuki Hayashi ( | Tails) Nobutoshi Canna ( | Knuckles) Chikao Ōtsuka ( | Eggman) Taeko Kawata ( | Amy) Shun Yashiro ( | Big) Kaori Asoh ( | Tikal) Jōji Nakata ( | Gamma) Tōru Ōkawa ( | Pachacamac) Kaho Kōda (Station Square Train Voice) | Nobutoshi Canna (Mystic Ruins Train Voice) | Elara Distler (Default Menu Voice) | Tomoko Sasaki (
Believe In Myself | It Doesn't Matter | Lazy Days | My Sweet Passion | Open Your Heart | Unknown from M.E.
Sonic Adventure Original Sound Track (Digi-Log Conversation) | Sonic Adventure Remix | Sonic Adventure: Songs With Attitude Vocal Mini-Album | Sonic Adventure Original Soundtrack 20th Anniversary Edition | Passion & Pride: Anthems with Attitude from the Sonic Adventure Era
777 Slots Pinball | Angel Island | Auto Running | Black Market | Card & Pinball | Chao Adventure^ | Chao Garden ( Station Square Garden, Mystic Ruins Garden, Egg Carrier Island) | Chao Race | Chao Stadium | Chao in Space | Chao Machine | Chao Search* | Corkscrew loop | Debug Mode | E-100 Series | Egg Carrier | Egg Carrier 2 | Emerald Radar | Freeze | Life gauge | Mission Mode | Mystic Ruins | Shrine of Knuckles's race | Shuttle loop | | Sonic Adventure (LCD) Station Square | Station Square Police Department | Tails' Lab | Tornado | Tornado 2 | Transporter Machine
Sonic Adventure DX: Director's Cut ^Exclusive to Dreamcast version of Sonic Adventure