--- a/src/GameSrc/hkeyfunc.c
+++ b/src/GameSrc/hkeyfunc.c
@@ -1465,3 +1465,71 @@
 #pragma enable_message(202)
 
 #endif // NOT_YET
+
+#ifdef __ANDROID__
+// Tops up parts of the player's state; android/app/src/main/cpp/qs_config.c
+// calls it once per frame with the "unlimited" cheats that are switched on.
+// `what` is a bitmask: 1 health, 2 energy, 4 ammo, 8 items (the same values as
+// QS_CHEAT_MASK_* in qs_config.c). Only conventional guns use ammo: beam and
+// melee weapons keep heat in the same field, so they are left alone (beams draw
+// on energy). Spare ammo clips, grenades and drugs are only refilled for kinds
+// the player already holds, so the cheat never creates items.
+void qs_cheat_refill(int what) {
+    const int kAmmoFloor = 99;
+    const int kItemFloor = 99;
+    uchar vitalsChanged = FALSE;
+    uchar inventoryChanged = FALSE;
+
+    if (player_struct.dead)
+        return;
+    if ((what & 1) && player_struct.hit_points < PLAYER_MAX_HP) {
+        player_struct.hit_points = PLAYER_MAX_HP;
+        vitalsChanged = TRUE;
+    }
+    if ((what & 1) && player_struct.cspace_hp < PLAYER_MAX_HP) {
+        player_struct.cspace_hp = PLAYER_MAX_HP;
+        vitalsChanged = TRUE;
+    }
+    if ((what & 2) && player_struct.energy < 255) {
+        player_struct.energy = 255;
+        vitalsChanged = TRUE;
+    }
+    if (vitalsChanged)
+        chg_set_flg(VITALS_UPDATE);
+
+    if (what & 4) {
+        for (int i = 0; i < NUM_WEAPON_SLOTS; i++) {
+            weapon_slot *slot = &player_struct.weapons[i];
+            if (slot->type != EMPTY_WEAPON_SLOT && slot->type <= GUN_SUBCLASS_SPECIAL &&
+                slot->ammo < kAmmoFloor) {
+                slot->ammo = kAmmoFloor;
+                inventoryChanged = TRUE;
+            }
+        }
+        for (int i = 0; i < NUM_AMMO_TYPES; i++) {
+            if (player_struct.cartridges[i] > 0 && player_struct.cartridges[i] < kItemFloor) {
+                player_struct.cartridges[i] = kItemFloor;
+                inventoryChanged = TRUE;
+            }
+        }
+    }
+    if (what & 8) {
+        for (int i = 0; i < NUM_GRENADEZ; i++) {
+            if (player_struct.grenades[i] > 0 && player_struct.grenades[i] < kItemFloor) {
+                player_struct.grenades[i] = kItemFloor;
+                inventoryChanged = TRUE;
+            }
+        }
+        for (int i = 0; i < NUM_DRUGZ; i++) {
+            if (player_struct.drugs[i] > 0 && player_struct.drugs[i] < kItemFloor) {
+                player_struct.drugs[i] = kItemFloor;
+                inventoryChanged = TRUE;
+            }
+        }
+    }
+    if (inventoryChanged) {
+        chg_set_flg(INVENTORY_UPDATE);
+        mfd_force_update();
+    }
+}
+#endif