Boktai - The Sun Is in Your Hand - Platform: Gameboy Advance

Unlockables: 
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Sound Test 
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Collect all 30 Silver Coins in the game. 

Dark Lens 
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Complete the game two times 

Hard Mode
--------- 
Simply complete the game and this is unlocked. 

More Sensitive Solar Sensor
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When the game asks to cover the Solar Sensor with your 
hand, do this in as dark a place as possible. If done 
right, the Solar Sensor will be extra sensitive 

New Game + 
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Simply complete the game and this is unlocked. 

The Sun is in your...Bedroom?
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If the Sun isn't on your side, you can easily get more 
than 7 bars on your Solar Sensor. Simply get a black 
light (they look purple, and make things seem to glow). 
These give off lot's of UV rays, which the Solar Sensor 
then detects! You need to hold it pretty close to get a 
good reading, and it's easy with one of the long, cylinder 
lights, which are pretty cheap and fun to play with.