Ninja Village Squadron Act 4 is a targeted farm, so treat it as a reward route instead of a stage to grind blindly as soon as it appears. Madora and Gunbai are tied to the Chapter 4 or Act 4 Ninja Village Squadron route, and the farm starts to make sense only after the team can reach that stage and repeat it. Check the reward screen before a long session so you know the item or unit you want is still there.
The unlock path matters because Act 4 is not the first Ninja Village stop. The route sits after Ninja Village Story progress and the earlier Ninja Village Squadron stages, so the first win condition is simply reaching Act 4 with a team that does not fall apart on the way. If those earlier stages still fail, the better play is usually wave clear, boss damage, placement timing, or basic account upgrades before trying to force the Act 4 farm.
Once Act 4 opens, the first few runs are for reading the stage. If normal enemies leak while the main unit is locked onto something else, the lineup needs wave clear, support, tanking, or earlier placement value. If the boss or high-health target survives too long, the main carry needs traits, gear, stat rolls, levels, or a better damage slot. If the board stabilizes too late, economy or perk upgrades can fix the run faster than replacing every unit.
Madora and Gunbai farming rewards clean repetition. A close manual clear proves the stage can be beaten, but it is not a farming setup yet. Rare reward routes get painful when each attempt drags on or fails every few runs. The farm feels ready when Act 4 clears stay steady across repeated attempts and the same leak, boss, or Yen problem is not showing up again and again.
Normal and Hard can shift with updates, so choose by the stage menu and your clear speed. If Hard shows better reward value but the clear is much slower or fails often, Normal can still be the smarter farm because completed runs matter more than staring at a better reward table after a loss.
Madora's tier-list value is not enough reason to camp Act 4 on a weak team. The unit still needs time, traits, gear, stats, Gold, and other resources after it drops. If Act 4 is messy, clean up the roster first. If Act 4 is already stable, then the route is simple: farm Ninja Village Squadron Act 4 for Madora and Gunbai, keep the reward screen open before long sessions, and leave when the stage is clearly asking for upgrades instead of more attempts.