This is not based on the R-Type II arcade game. In Japan, R-Type for PC Engine was released in two parts: R-Type I and R-Type II. This game contained the second 4 stages.
BDA-7638-NB
from the first game, so I guess I'll try that.
webrender.rb:2332:output_full_game(DB, @2690, options: {})ocdgamer.rb:902:output_entries_filtered( @2690, headline:Passwords / Cheat Codes, [filter], show_dates:false) ocdgamer.rb:902:output_entries_filtered( @2690, headline:Facts, [filter], show_dates:false) ocdgamer.rb:902:output_entries_filtered( @2690, headline:Analysis, [filter], show_dates:false) ocdgamer.rb:902:output_entries_filtered( @2690, headline:Quotes, [filter], show_dates:false) ocdgamer.rb:902:output_entries_filtered( @2690, headline:Technical Notes, [filter], show_dates:false) ocdgamer.rb:902:output_entries_filtered( @2690, headline:, [filter], show_dates:true) ocdgamer.rb:902:output_entries_filtered( @2690, headline:Log entries, [filter], show_dates:true)