Söldner-X 2: Final Prototype

Complete the first stage ('Zeus Sector') at any difficulty level

Complete the third stage ('Ethia Ruins') at any difficulty level

Complete the fifth stage ('Turady Deep Sea') at any difficulty level

Clear challenge 'Survivor'

Clear challenge 'Collector'

Clear challenge 'Action Fan'

Clear challenge 'Chain Expert'

Clear challenge 'Profiler'

Clear challenge 'Rating Expert'

Collect an accumulated total of 77777 chain rings

Collect all 35 secret keys in stage one through seven

Unlock and successfully pass 12 or more base challenges

Clear challenge 'Speed Gunner'

Clear challenge 'Stage Keys'

Clear challenge 'Speed Collector'

Clear challenge 'Rank Master'

Clear challenge 'Kill Collector 1'

Clear challenge 'Score Collector 1'

Clear challenge 'Hellfire'

Complete the tenth stage ('Inner Core') at any difficulty level

Unlock at least seven specials

Collect all 15 secret keys in stage eight through ten