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ReactionLab 2 is a critically acclaimed 8-bit particle sandbox, and quite possibly the best game of its type on Android. Let your inner mad scientist shine by drawing elements onto the canvas and watching them interact in real time. Featuring well over 60 elements, hundreds of different particle types, and nearly 100 achievements to attain. There are endless creative possibilities and undiscovered combinations. Try to find every reaction, or just build something awesome, it's up to you!

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A look into what complex contraptions are possible in ReactionLab 2. Featuring a force field gun, smoke detector, and even a simple calculator.

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Achieved 100% completion in ReactionLab 2? That's only scratching the surface of what's possible! This article will take a look at a few complex examples of what can be done ingame.

Force field gun:
This type of construct is visible in the official trailer at around the 0:37 mark. Essentially, since the force field expands outwards horizontally, a stack of rocks is placed in front of it to block its path. When the fuse burns away, the rocks fall downward, allowing the force field to expand out the barrel of the 'gun'.

Gameplay screenshots 4 - contraptionsGameplay screenshots 4 - contraptions

Smoke Detector:
Moving into more complicated territory, a smoke detector construct will spout water when it detects smoke. This can be achieved by layering ice directly underneath a battery, and metal prongs directly below the ice. Since smoke causes ice to melt, the electricity can arc from the battery to the metal prongs, which can then energize surrounding pumps. For bonus points, Aerolucent and Aqualucent can be added to make the smoke detector more reliable.

Gameplay screenshots 4 - contraptionsGameplay screenshots 4 - contraptions

Simple Calculator (Half-Adder):
This is definitely up there on the list of most complicated things you can make in ReactionLab 2. A half-adder is a type of simple calculator that can add two ones (or zeroes) together in binary. It is composed of a AND gate and an XOR gate, you'll have to see the wikipedia links for full context as they can both be fairly confusing to explain.
In ReactionLab 2, these two gates can be created using fuse, water, and potassium, with aqualucent and drain acting to make the circuit easier to design. Fuse is the primary element used here, it is essentially the 'wires' of the circuit, though one limitation of the half-adder as a result of this, is that it's single use. Yep, all that trouble just to add two ones together, ONCE.

Gameplay screenshots 4 - contraptionsGameplay screenshots 4 - contraptions
Gameplay screenshots 4 - contraptions

Challenge: design a full-adder.

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