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_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