Press Esc to pause the game and type: 
 
 NO MORE ROAD SPLATS - Infinite Lives
 SHOW ME MORE ZONES PLEASE - All Zones Open
 WAY TOO HARD FOR THE LIKES OF ME - All Levels Open
 I AM THE KING OF THE WORLD - Invincibility
 TIME FLIES WHEN YOURE HAVING TROUBLE - Infinite Time
 
 All Yellow Frog Locations: 
 
 The 5th truck level
 The 4th lily pad level
 The 2nd leaf level
 The 1st crank level
 The 3rd bat level
 The 5th cloud level
 The 3rd bony fish level
 The 4th cactus level
 The temple in the banana level 
 
 Hints and Tips 
 
 * How to avoid those bees! Hide behind stumps. Don't try and outrun
   them - they're fast! Finally, use the powerups wisely. 
 
 * Keep running out of lives? Replay a level you're good at to build
   your lives up. 
 
 * Can't find the baby frogs? Croak, and listen carefully for the
   reply. The louder it is, the closer you are. 
 
 * Don't forget that when Frogger hops, momentum will affect him 
   in the air. If you are jumping around on fast moving objects, 
   make sure you jump early otherwise you'll travel past what you're
   trying to hop onto. 
 
 * Remember that your superhop gives you a few extra seconds of
   'hang time'. This can be useful for hopping over fast moving
   objects such as mowers and cars. 
 
 * If you're stuck on a level, try watching the demo mode; it might
   give you a few ideas on how to approach the levels. 
 
 * Learn your baby frog positions. Once you know where all of the
   baby frogs are on each level, your task will become easier. 
 
 * Although the game may appear daunting at first, remember that 
   Frogger's opponents all have patterns and the best way to beat
   the game is to learn those patterns. For example, once you know
   where the boulders bounce on Desert 2, climbing the slopes will
   be much easier.... 
 
 * Learn the way the balloons move on the Sky levels but remember,
   they can only support Froggers weight for a short amount of time
   before they hop..... 
 
 * Know your friendly birds. There are some birds which will always
   give you a helping hand, no matter what level you are on.