In terms of game file size, you will need at least 600 MB of free disk space available. Castle Explorer system requirements state that you will need at least 1 GB of RAM. An Intel Pentium 4 2.00GHz CPU is required at a minimum to run Castle Explorer. The cheapest graphics card you can play it on is an NVIDIA GeForce GTX 1080.
Castle Explorer will run on PC system with Windows XP and upwards.
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