Zona Alfa

Zona Alfa is a set of simple, fast-play skirmish rules for scavenging, exploring, and   surviving in a near-future, post-apocalyptic Eastern European setting. Players take on   the role of bandits, mercenaries, and military units fighting over the blasted Exclusion   Zone and its abandoned artefacts. Customise your fighters with a variety of weapons   and specialisms to create your ideal warband. With extended rules for campaigns,   character progression, terrain, and environmental hazards, Zona Alfa contains all the tools required to engage in blistering firefights within the Exclusion Zone. Here are the Solo/cooperative rules: https://ospreypublishing.com/blog/cat/osprey-games/post/solo_coop_rules_free_download/