Lasers are your main weapon against Aliens (except Gus, who is immune to them except in the Final Boss Fight). You start with a class 1 Laser, and by spending money you can upgrade it in stages to class 10, which can be fired continuously (saving strain on your finger and your mouse button). An upgrade in Adventure Mode and Time Trial Mode will cost $1000 in Tank 1 and 2, $2000 in Tank 3 and $5000 in Tank 4. Laser upgrades in Challenge Mode will start from these prices and increase (as does everything).
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