Kars was obtainable for a limited time as a collaboration character in the mobile game Puzzle & Dragons.
カーズ
Attributes: 
Rarity: 6★ (Base)
No. 9582
HP
3,329 (Lvl.99)
ATK
3,102 (Lvl.99)
RCV
156 (Lvl.99)
Active Skill: "Mode: Light Blades" (Localized Name: "Brilliant Bone Blade")
Pierce through enemies' damage void for 3 turns, all Orbs enhanced; changes to Tribe of Darkness, Kars
Leader Skill: "Pillar Man"
15x ATK & reduces damage by 70% when Light & Dark attack at once; inflicts 1 damage with 2+ Dark combos
闇の一族 カーズ
Attributes:
Rarity: 7★ (Transformation)
No. 9565
HP
5,396 (Lvl.99)
ATK
5,770 (Lvl.99)
RCV
604 (Lvl.99)
Active Skill: "I emerge victorious!"
1.5x Orb move time, pierce enemies' dmg void, +4 combos & increase this ally's damage cap to 4 billion for 1 turn
Leader Skill: "Fighting Stance"
15x ATK & vastly reduces dmg when Light & Dark attack; 2x ATK & inflicts 3,000,000 damage with 2+ Dark combos
エイジャの赤石
Attributes:
Rarity: 7★ (Assist Evolution)
No. 9566
HP
5,231 (Lvl.99)
ATK
4,455 (Lvl.99)
RCV
279 (Lvl.99)
Active Skill: "Ripple Amplifier" (Localized Name: "Hamon Amplifier")
2.5x ATK for Dark Att. for 6 turns
Leader Skill: "N/A"
N/A