In addition to the already-announced allotment of free games PlayStation Plus members have gotten this month, an extra freebie is coming tomorrow for PlayStation 3 owners in the form of a substantial free trial of Battlefield 4.

Game trials are nothing new to Plus, but whereas they typically allow Plus subscribers to try out a game for only an hour, this one will entitle them to play Battlefield 4 for 20 hours. You'll only get access to content from the base game--which is, it should be noted, a substantial amount--but that unfortunately means you'll still have to pay if you're interested in trying out content from any of the three expansion packs released so far.

Since being released last October, Battlefield 4 has suffered from numerous technical problems. Future development was actually placed on hold at one point as publisher EA and developer DICE attempted to resolve these issues, many of which have been fixed as patches were rolled out. Things are still far from perfect, however, and DICE recently launched a new "Community Test Environment" on PC that it's using to test changes and improvements.

Should the trial not be of interest to you, it's luckily not the only thing Plus members get tomorrow, as Limbo for PlayStation Vita will be added to the Instant Game Collection. GameSpot's review of the Vita version notes that it's still the same great game released on consoles and PC, but lacks some of those versions' visual fidelity.

A small handful of discounts will also be available to Plus members as follows:

• Mind Zero (Vita) -- $27.19 (regular price: $33.99)
• Master Reboot (PS3) -- $7.64 (regular price: $14.99)
• The LEGO Movie Videogame (PS4) -- $40.49 (regular price: $59.99)
• The LEGO Movie Videogame (PS3) -- $33.74 (regular price: $49.99)
• The LEGO Movie Videogame (Vita) -- $20.24 (regular price: $29.99)

Lastly, this next week represents the last chance to download five free Plus games--Resogun, Uncharted 3: Drake's Deception's single-player mode, Stick it to the Man, Pro Evolution Soccer 2014, and LittleBigPlanet Karting--which will be leaving the service on June 3. By simply initiating a download on any of these, they will be attached to your account so that they can be re-downloaded and played for as long as you remain a Plus subscriber.