--- a/share/hedgewars/Data/Missions/Campaign/A_Space_Adventure/cosmos.lua	Mon Sep 25 21:18:59 2017 +0200
+++ b/share/hedgewars/Data/Missions/Campaign/A_Space_Adventure/cosmos.lua	Mon Sep 25 21:41:38 2017 +0200
@@ -191,6 +191,11 @@
 		AddAmmo(hero.gear, amJetpack, 100)
 	end
 
+	-- Reset checkpoint of other missions when entering this mission.
+	-- The player has left the planet, so we count that “abandoning” any incomplete missions.
+	-- This also allows the player (indirectly) to reset the checkpointed missions.
+	abandoned = resetCheckpoint()
+
 	AddEvent(onHeroDeath, {hero.gear}, heroDeath, {hero.gear}, 0)
 	AddEvent(onNoFuelAtLand, {hero.gear}, noFuelAtLand, {hero.gear}, 0)
 	-- always check for landings

--- a/share/hedgewars/Data/Missions/Campaign/A_Space_Adventure/global_functions.lua	Mon Sep 25 21:18:59 2017 +0200
+++ b/share/hedgewars/Data/Missions/Campaign/A_Space_Adventure/global_functions.lua	Mon Sep 25 21:41:38 2017 +0200
@@ -118,13 +118,16 @@
 	if GetCampaignVar("CurrentMission") ~= mission then
 		SaveCampaignVar("CurrentMission", mission)
 		SaveCampaignVar("CurrentMissionCheckpoint", 1)
-		SaveCampaignVar("HogsPosition", "")
 	else
-		checkPoint = tonumber(GetCampaignVar("currentMissionCheckpoint"))
+		checkPoint = tonumber(GetCampaignVar("CurrentMissionCheckpoint"))
 	end
 	return checkPoint
 end
 
+function resetCheckpoint(mission)
+	SaveCampaignVar("CurrentMissionCheckpoint", 1)
+end
+
 function saveCheckpoint(cp)
 	SaveCampaignVar("CurrentMissionCheckpoint", cp)
 end