How does cross-breeding work?
Cross-breeding happens in the Reactor at your base: you pick two mutants and combine them, and the result depends on the gene types of both parents. Mixing different genes unlocks new hybrid mutants, and breeding high-level mutants can produce Elite versions with extra power. Breeding is usually a better deal than buying mutants outright with Gold.
How do the six gene types matter?
The six gene types, Sabre, Necro, Cyber, Zoomorph, Galactic, and Mythic, each beat some genes and lose to others. Learning the matchup chart lets you bring the right mutants against an opponent's lineup, which wins more PvP fights and keeps the Gold from victories flowing.
What makes a strong PvP team?
A strong 3v3 team covers multiple gene types so you are not hard-countered by a single opponent. Mix attackers that exploit common weaknesses with at least one durable mutant, and prioritize Elite versions of your best units. Climbing the six-division ladder pays larger rewards as you go, so a balanced team compounds your Gold income.
How does this tie into free Gold?
Elite upgrades and rare breeds cost Gold, so a steady Gold supply is what lets your team keep improving. Stack the daily login reward, daily missions, PvP victories, and the occasional gift links Morning Reward lists, and you keep breeding and upgrading without spending real money.