Another one of the PlayStation Plus free games for the month is set to enter the Instant Game Collection this week.

According to PlayStation Lifestyle, "Castle of Illusion Starring Mickey Mouse," the last of the PS3 games announced to be part of the PlayStation Plus free games will be featured in Sony's Instant Game Collection for the US members.

The 16-bit classic will enter tomorrow, April 15 as a PlayStation Plus free game. The game is developed by Sega Studios Australia, and as described on Joystiq, it "expands on Mickey's classic platformer with new exploration elements, 3D platforming sequences, and retooled boss encounters."

Furthermore, Gamespot reports that PS Plus subscribers who grab the game before April 28 will also get the original "Sega Genesis version of 1990's Castle of Illusion and a Mizarabel dynamic theme."

The other PlayStation Plus free games revealed for April are PS3 games "Stealth Inc: A Clone In the Dark," Batman: Arkham City," "Mercenary Kings for PS4," and PS Vita titles "PixelJunk Monsters: Ultimate HD" and "Velocity Ultra."

Meanwhile, PS Plus members can grab their own copies of various titles for the PS4 game, "Pure Chess" as well as LEGO games as they will be on sale this week. Below are the Lego titles that are going to be on sale this week.), $29.99

LEGO Batman 2: DC Super Heroes (PS3) - $12.59 (PS+ Price), $29.99 (Regular Price)

LEGO Batman 2: DC Super Heroes (PSV) - $12.59 (PS+ Price), $19.99 (Regular Price)

LEGO Harry Potter: Years 5-7 (PS3) - $12.59 (PS+ Price), $19.99 (Regular Price)

LEGO Legends of Chima: Laval's Journey (PSV) - $12.59 (PS+ Price), $19.99 (Regular Price)

LEGO Lord of the Rings (PS3 or PSV) - $12.59 (PS+ Price), $19.99 (Regular Price)

LEGO Marvel Super Heroes (PS4) - $31.49 (PS+ Price), $59.99 (Regular Price)

LEGO Marvel Super Heroes (PS3) - $25.19 (PS+ Price), $49.99 (Regular Price)

LEGO Marvel Super Heroes (PSV) - $18.89 (PS+ Price), $29.99 (Regular Price)

To see the entire list of discounted PS Plus games for this week, visit this US PlayStation Blog link.