Lock's Quest – a Tower Defense video game in which the player controls a young man named Locke. Locke is a gifted young man with the ability to create amazing mechanisms thanks to the Source. This is a mysterious force that once enabled the protagonist's home kingdom to build mighty and wondrous metal creatures. The leading researcher in this field was a man named Agony, but the king banished him, fearing that the gift would be used for evil. Seeking revenge, Agony attacked the kingdom at the head of a huge army and was defeated with great difficulty. Decades have passed since then, and the evil lord has returned with a new army. Locke, the towers created by the boy, and the king's soldiers are the main obstacle in the path of the mechanical monsters.

Each type of troops has its strengths and weaknesses – both the protagonist's assistants and the spawn of Lord Agony. A properly equipped army and traps in the right positions are the main way to win, which forces the player to carefully think through the strategy. In addition to the story campaign, Lock's Quest has several additional modes that help diversify the passage. For example, in the Defense of Antonia campaign, the player can try to repel an endless wave of opponents, constantly building towers and calling for help from soldiers. The further the user advances, the stronger the enemies will be and the more powerful buildings will become available.