 If the player can complete an entire level without losing a life after breaking open a Check Point box , a special " Stage Clear " screen appears in which the player is informed of how well they 've done and if any special items have been earned . They are also shown how many boxes ( if any ) have been missed in the level . If a life has been lost during the stage , the player is simply returned to the world map . If the player manages to both complete a level without losing a life after breaking open a Check Point box and break open all of the boxes in that level , they are awarded a gem . Gems allow the player to enter new areas in previously completed levels that were not accessible before . 
