while(0 == jumpnrun_pick_level(buf, &first_visible, &selected, progress)) {
if(JUMPNRUN_WON == jumpnrun_play_level(buf) && selected == progress) {
while(0 == jumpnrun_pick_level(buf, &first_visible, &selected, progress)) {
if(JUMPNRUN_WON == jumpnrun_play_level(buf) && selected == progress) {