The best alternatives to ΞTHEREST Ethereum Contract API are WTF is Ethereum?, Ethereum, and Khaki Projects. If these 3 options don't work for you, we've listed a few more alternatives below.
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Ethereum is a global, decentralized platform for money and new kinds of applications. On Ethereum, you can write code that controls money, and build applications accessible anywhere in the world.
Hash Heroes is an Ethereum Blockchain Dapp game. Players use Ether to claim tiles, and when the final tile is claimed, the blockhash for that block determines the coordinates of the winning tile.