boolean bd_wraparound_objects; // BD cave object rendering uses wrap-around
boolean bd_scan_first_and_last_row; // BD engine scans top and bottom border rows
boolean bd_short_explosions; // BD engine uses four game cycles for explosions
+ boolean bd_gravity_affects_all; // BD engine gravity affects all falling objects
boolean bd_intermission; // BD level is intermission
boolean bd_diagonal_movements; // BD style diagonal movements
+ boolean bd_topmost_player_active; // BD engine uses first player found on playfield
boolean em_slippery_gems; // EM style "gems slip from wall" behaviour
boolean em_explodes_by_fire; // EM style chain explosion behaviour
boolean use_spring_bug; // for compatibility with old levels