怎么在植物大战僵尸2国际版上自制关卡？

最近我在录拓展关卡视频，PVZ2吧里应该有攻略的，可以看一下，我看过他们发布自制关卡，但不是很清楚。

{!-- PGC_VIDEO:{"status": 0, "thumb_height": 360, "thumb_url": "4229000fbcac5a267ee4", "media_id": 1558658987380737, "vname": "\u9762\u9762\u9762\u56e2\u300a\u690d\u7269\u5927\u6218\u50f5\u5c382\u56fd\u9645\u7248\u300b\u72c2\u91ce\u897f\u90e8\u62d3\u5c55\u5173\u5361\u7b2c35\u5929.mp4", "vid": "2fe2965de83c47f1b67b09144c9df2b7", "vu": "2fe2965de83c47f1b67b09144c9df2b7", "src_thumb_uri": "422e000640879d2179e4", "neardup_id": 3377244975015093695, "sp": "toutiao", "vposter": "http://p0.pstatp.com/origin/4229000fbcac5a267ee4", "external_covers": [{"mimetype": "webp", "source": "dynpost", "thumb_height": 360, "thumb_url": "422d0006ed3b0972f7bd", "thumb_width": 640}], "thumb_width": 640, "item_id": 6483010195990512142, "video_size": {"high": {"h": 480, "subjective_score": 0, "w": 854, "file_size": 19276898}, "ultra": {"h": 720, "subjective_score": 0, "w": 1280, "file_size": 34641442}, "normal": {"h": 360, "subjective_score": 0, "w": 640, "file_size": 13898746}}, "duration": 255, "user_id": 55292891819, "group_id": 6483010195990512142, "md5": "f90d748094ee106f75947360eac703a3", "hash_id": 17006794345819326911} --}

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