extern void InitFly(T_EXTRA *,short ,short ,short ,short );
extern void BounceExtra(T_EXTRA *,short ,short ,short );
extern short ExtraBonus(short ,short ,short ,short ,short ,short ,short );
extern short ExtraExplo(short ,short ,short );
extern short SearchBonusKey(void);
extern short ExtraSearch(short ,short ,short ,short ,short ,short ,short ,short );
extern short ExtraSearchKey(short ,short ,short ,short ,short ,short );
extern short ExtraCheckObjCol(T_EXTRA *,short );
extern short ExtraCheckExtraCol(T_EXTRA *,short );
extern unsigned char FullWorldColBrick(short ,short ,short ,short ,short ,short );
extern void ClearScreenMinMax(void);
extern void AdjustScreenMax(void);
extern void Aff2DShape(short *,short ,short ,short ,short ,short );
extern void AffSpecial(short ,short ,short );
extern void InitSpecial(short ,short ,short ,short );
extern long CoulRetourBalle(T_EXTRA *);
extern void ClearExtra(void);
extern short ThrowExtra(short ,short ,short ,short ,short ,short ,short ,short ,short ,short );
extern void GiveExtraBonus(T_OBJET *);
extern void ZoneGiveExtraBonus(T_ZONE *);
extern void GereExtras(void);