diff --git a/backend/internal/game/revive.go b/backend/internal/game/revive.go
new file mode 100644
index 0000000..e38eb0a
--- /dev/null
+++ b/backend/internal/game/revive.go
@@ -0,0 +1,59 @@
+package game
+
+import (
+	"errors"
+
+	"github.com/denisovdennis/autohero/internal/model"
+	"github.com/denisovdennis/autohero/internal/tuning"
+)
+
+var (
+	// ErrReviveQuotaExceeded is returned when a non-subscriber has used their free revives.
+	ErrReviveQuotaExceeded = errors.New("revive quota exceeded")
+	// ErrReviveNotDead is returned when revive is requested for a living hero.
+	ErrReviveNotDead = errors.New("hero is not dead")
+)
+
+// IsEffectivelyDead is true when the hero must be revived to keep playing.
+func IsEffectivelyDead(hero *model.Hero) bool {
+	if hero == nil {
+		return false
+	}
+	return hero.State == model.StateDead || hero.HP <= 0
+}
+
+// CheckPlayerReviveQuota enforces the same limits as POST /hero/revive (non-subscribers only).
+func CheckPlayerReviveQuota(hero *model.Hero) error {
+	if hero == nil {
+		return ErrReviveNotDead
+	}
+	if !hero.SubscriptionActive && hero.ReviveCount >= 2 {
+		return ErrReviveQuotaExceeded
+	}
+	return nil
+}
+
+// ApplyHeroReviveMechanical sets partial HP, walking state, clears debuffs, and consumes resurrection buff.
+// Used for timeout auto-revive, offline catch-up, and as the base step for button/admin revive.
+func ApplyHeroReviveMechanical(hero *model.Hero) {
+	if hero == nil {
+		return
+	}
+	hero.HP = int(float64(hero.MaxHP) * tuning.Get().ReviveHpPercent)
+	if hero.HP < 1 {
+		hero.HP = 1
+	}
+	hero.State = model.StateWalking
+	hero.Buffs = model.RemoveBuffType(hero.Buffs, model.BuffResurrection)
+	hero.Debuffs = nil
+}
+
+// ApplyPlayerReviveProgressCounters matches POST /api/v1/hero/revive side effects (quota uses ReviveCount).
+func ApplyPlayerReviveProgressCounters(hero *model.Hero) {
+	if hero == nil {
+		return
+	}
+	hero.TotalDeaths++
+	hero.KillsSinceDeath = 0
+	hero.ReviveCount++
+}