Mysteria ~Occult Shadows~ is a 3D action-adventure RPG developed and published by U-Secret Studio, an independent team that built the game around an unusual mixture of anime aesthetics, supernatural fantasy, mythology, and hack-and-slash combat. The adventure follows the Shadow of Death, a fearless cat-girl warrior exploring Sulnas, a land contaminated by a mysterious dark power. Her objective is essentially one of purification and discovery, with the journey gradually revealing secrets surrounding the Ferre civilization and the forces threatening the world. The premise is straightforward, but the darker atmosphere gives the setting more character than its colorful protagonist might initially suggest. Combat is the foundation of the experience. Battles take place in real time from a third-person perspective with a freely controlled camera, while three weapon types provide different approaches to attacking enemies. The protagonist's feline identity also influences traversal and fighting, since jumping and grappling allow her to move rapidly through environments and reposition herself during encounters. Quick-time sequences appear during certain finishing actions, giving some confrontations a more theatrical quality. Difficulty gradually increases as the campaign progresses, and a roster of more than 40 enemy varieties helps provide changing threats rather than relying on one repeated opponent design. Exploration gives the game additional substance outside combat. The campaign contains 14 levels spread across 10 maps, including forbidden areas where information about the Ferre civilization can be uncovered. Mysteria also uses puzzles and mythological elements as environmental storytelling devices, meaning the player is encouraged to pay attention to the surroundings rather than treating every location as a simple path toward the next battle. Main and secondary stories incorporate supernatural themes, strengthening the impression that Sulnas has a larger history behind its immediate crisis. The complete adventure is designed to take roughly six to ten hours, which is a sensible duration for an independent action game of this scope. There is enough time for combat mechanics, exploration and story elements to develop without stretching the basic systems excessively. Fully animated cutscenes provide narrative transitions, while Japanese voice acting contributes to the game's anime-inspired presentation. Full controller support is another welcome inclusion because the combination of dodging, jumping, grappling and rapid attacks feels naturally suited to a gamepad. Visually, Mysteria tries to blend dark fantasy environments with stylized character artwork. Its use of stylized physically based rendering and elaborate lighting creates environments that can occasionally be quite atmospheric. The darker locations, supernatural creatures and violent confrontations contrast heavily with the colorful heroine and the game's extensive collection of costumes. This contrast is clearly intentional and forms a major part of Mysteria's identity. The presentation may not consistently reach the refinement of a larger-budget action RPG, but there is noticeable ambition in the visual direction. Customization is surprisingly extensive. More than ten outfits are available either through gameplay or free downloadable content, including maid clothing, kimono-inspired costumes, combat suits, wedding attire and other designs. Weapon skins provide further cosmetic variation. Portrait functionality and customizable cutscene features reinforce the emphasis on presenting the protagonist according to the player's preferences. None of these additions radically changes the underlying combat, but they add personality and provide incentives for players who enjoy character customization. The soundtrack, composed by project lights, supports the supernatural atmosphere and gives the environments additional energy during exploration and combat. Combined with Japanese voice performances and animated story sequences, the audio presentation demonstrates the developer's desire to make Mysteria feel like a complete fantasy adventure rather than merely a collection of combat arenas. There are also 39 Steam achievements, providing additional objectives for players interested in completion. Technical roughness is one of the game's more noticeable weaknesses. U-Secret Studio acknowledges that certain areas can experience lower frame rates because maps are being loaded and performance can depend on storage I/O speed. This reflects the broader nature of Mysteria: its ideas sometimes exceed the level of technical refinement the production can consistently deliver. Animation, camera behavior, movement and environmental transitions can occasionally expose its independent origins. These imperfections do not erase the strengths of the underlying concept, but players expecting the smoothness of a major character-action release should adjust their expectations. Mysteria also contains mature material, including frequent violence and gore. Its identity combines brutal fantasy action with fan-service-oriented anime character designs, including revealing costumes and suggestive visual elements. This mixture is central to the game's presentation rather than something confined to a small optional section. Players interested primarily in traditional fantasy role-playing may therefore find the tonal combination unusual, while audiences comfortable with anime fan service and violent hack-and-slash action are more likely to appreciate what the developers were attempting. What ultimately makes Mysteria ~Occult Shadows~ interesting is its willingness to combine many ideas within a relatively compact independent project. Combat, agile traversal, puzzles, alternate mythology, supernatural storytelling, numerous enemy designs, cosmetic customization, Japanese voice acting and cinematic sequences all contribute to an adventure with a recognizable personality. The individual systems are not always sophisticated enough to compete with specialized games built around any one of these elements, yet their combination prevents Mysteria from feeling completely generic. The experience is consequently easier to recommend to players who value unusual concepts and distinctive aesthetics over immaculate production quality. Its combat can be enjoyable, its protagonist is highly customizable, and the mystery surrounding Sulnas and the Ferre civilization provides motivation to continue exploring. At the same time, technical limitations and uneven polish prevent its strongest ideas from reaching their full potential. Mysteria remains an ambitious, occasionally rough but genuinely distinctive action RPG that offers considerably more content and variety than its niche appearance might imply. Rating: 7/10