My fisrt time use this~! ^^

Release

Ubisoft announced the game at their press conference during Electronic Entertainment Expo 2014.^[55] In August 2015, Ubisoft announced that they had delayed the game's release from October 10 to December 1, 2015, in order to give additional time for the team to balance the game for cooperative multiplayer play.^[56] A closed alpha-testing was held by Ubisoft on April 7–13, 2015, in which players could play an early version of the game in order to help the development team test their servers and core gameplay loops, and to provide feedback.^[57] Ubisoft held a closed beta, starting on September 24, 2015, for further testing. The company originally wanted to hold another round of testing with the release of the game's open beta on November 25, 2015, but they delayed its release to November 26 due to matchmaking issues.^[58] Players who purchased Siege for the Xbox One could download Tom Clancy's Rainbow Six: Vegas and its sequel, Tom Clancy's Rainbow Six: Vegas 2 for free.^[59] To launch the game in Asian markets, Ubisoft announced plans to remove graphic imagery from all versions of the game via a patch.^[60] The plan was later withdrawn by the developer due to review bombing and negative fans feedback.^[61]

The game had multiple versions for players to purchase. A season pass was announced on November 12, 2015. Players who bought this version of the game could gain early access to operators offered in the DLCs and receive several weapon skins.^[62] The game was also released alongside its Collector's Edition, which included the game's season pass, a hat, a compass and bottle opener, a backpack, and a 120-page guide.^[63] A Starter Edition was released on PC in June 2016, featuring all content offered in the Standard Edition, and included two operators at start for use plus enough Rainbow 6 Credits to purchase up to two more of the player's choice while the rest has to be purchased through either Renown at an increased cost or additional Rainbow 6 Credits. The Starter Edition was cheaper than the Standard Edition and was initially available for a limited time.^[64] In February 2017, the Starter Edition became permanently available via Uplay.^[65]

According to Ubisoft, the game adopted a "game as a service" approach, as they would provide long-term support for the game and offer post-release content to keep players engaged. The management team initially doubted the idea but eventually decided to approve it.^[34] The title was supported with many updates upon launch, with the company introducing fixes to bugs and improvements on both matchmaking and general gameplay mechanics.^[66][67] They also introduced an auto-kick system, which automatically removes players from a match when they kill friendly players^[68] and launched the BattleEye system in August 2016 to punish cheaters.^[69] All downloadable content maps were released to all players for free.^[70] The team avoided adding more modes to the game because most would not fit well with the game's close-quarter combat.^[71]Downloadable content for the game was divided into several seasons, with a Mid-Season Reinforcement patch which added new weapons and modified some of the operators' core abilities.^[34] This post-release content was developed by the Montreal studio in conjunction with Blue Byte in Germany.^[72] Ubisoft announced that they would keep supporting the game and adding new playable characters for 10 more years. As a result, no sequel was planned.^[73] To counter toxicity within the game's community, in mid 2018 Ubisoft began issuing bans to any player who has used racist and homophobic slurs.^[74]

In January 2018, Ubisoft announced the introduction of 'Outbreak Packs', which are loot boxes that can be unlocked with R6 credits (which can be purchased with microtransactions) to gain character items. The company also announced that the base version of the game will be replaced by a bundle named The Advanced Edition, which includes the base game and a small number of outbreak packs and R6 credits. The changes resulted in players' backlash, as existing players have to pay for new content while new players do not.^[75] Ubisoft compensated players by giving players a free premium skin for free and announced plans to change the Standard Edition so that players can unlock new operators at a faster pace.^[76] In July 2018, Ubisoft announced the introduction of a limited time pack named 'Sunsplash Packs', which are available to purchase with R6 credits and contain cosmetics that have an association with the season of Summer.^[77] In October 2018, Ubisoft unveiled the Crimsonveil packs, which added a Halloween themed weapon skin, charm, headgear, and uniform for 4 operators, plus a seasonal weapon skin and a charm that was themed with the skin.^[78]

Downloadable content and expansion packs
Year	Name and Season	Release date	Notes
Year 1	Operation Black Ice — Season 1	February 2, 2016	The operation introduced a new map, a frozen yacht in Canada. It also introduces two Canadian operators from the special ops force JTF2, Frost and Buck. Frost can use a trap to incapacitate enemies, while Buck has an under-barrel M26 shotgun.[79]
Operation Dust Line — Season 2	May 11, 2016	The operation introduced a new map set in the Middle East, which was described as "a mix of old and new construction with open air pathways".[80] It also introduces two Navy Seal operators, Blackbeard and Valkyrie. Blackbeard has face shields that can be mounted onto his rifle, while Valkyrie has three cameras that can be thrown onto any surface.[81]
Operation Skull Rain — Season 3	August 2, 2016	The operation introduced a new map set in Brazil, and two BOPE operators called Capitão and Caveira.[82] Capitão has a tactical crossbow which can be loaded with asphyxiating bolts, that will burn oxygen within a certain radius, or smoke grenade bolts that create a thick cloud of smoke. Caveira has an ability called Silent Step, allowing her to make less noise when moving as well as interrogate an immobilized enemy for the location of other enemies.[83]
Operation Red Crow — Season 4	November 17, 2016	The operation introduced a new map set in a skyscraper in Japan, and two SAT operators called Hibana and Echo. Hibana possesses a weapon that launches up to three sets of six explosives that attach to and break reinforced walls, while Echo uses a drone capable of releasing sonic blasts to disorient enemies.[84]
Year 2	Operation Velvet Shell — Season 1	February 8, 2017	The operation introduced a new map set in Spain, and two GEO operators called Mira and Jackal.[85] Jackal is a tracker who can reveal the location of enemies by tracking their footprints, while Mira can create one-way bulletproof windows on walls which can be ejected, leaving a space for operators to fire through.[86][87]
	Operation Health — Season 2	June 6, 2017[88]	Operation Health was an update that fine-tuned many of the game's aspects, including fixes to hit boxes, spawn killing and audio issues.[89] This resulted in the delay of season 2's content and the cancellation of a map.[90]
	Operation Blood Orchid — Season 3	September 5, 2017[91]	The operation introduced a new map set in Hong Kong, two SDU operators named Ying and Lesion, and one Polish GROMoperator named Ela.[92] Ying utilizes candela cluster charges that can be thrown or attached to a surface to stun enemies, similar to a stun grenade. Lesion uses poison mines that slow and cause damage to an enemy over time when triggered. Ela possesses proximity concussion mines that can be attached to multiple surfaces to disorient enemies.[93][94]
	Operation White Noise — Season 4	December 5, 2017[95]	This operation introduced a new map set in South Korea, two South Korean operators from the 707th Special Mission Battalion named Dokkaebi and Vigil, and one Polish operator named Zofia. Dokkaebi is able to hack enemy phones to make them ring, revealing their position, she can also hack the phone of a dead defender to give access to the cameras to the attackers. Vigil uses a cloaking device to become invisible to all drones and cameras. Zofia carries a double-barreled grenade launcher capable of launching explosive or concussion grenades.[96]
Year 3	Operation Chimera — Season 1	March 6, 2018[97]	This operation introduced one GIGN operator named Lion, and one Spetsnaz operator named Finka. Both are part of a CBRN specialist detachment of Team Rainbow. Lion uses a UAV to temporarily expose moving enemies via sonar; Finka uses nanomachines to temporarily increase the health and accuracy of herself and her teammates while also increasing their heart and breathing rate, thus weakening them by increasing the damage taken by Smoke's toxic gas canisters, increasing the range Pulse's heartbeat scanner can detect them, and hindering their ability to listen for footsteps. The nanomachine boost will also revive any downed teammates. This DLC also introduced a temporary gamemode called "Outbreak", a PvEgame mode where some operators are tasked with containing a biohazard that has turned the citizens of Truth or Consequences, New Mexico into zombie-like monsters.[98]
	Operation Para Bellum — Season 2	June 7, 2018[99]	This operation introduced a new map set in Tuscany, as well as two GIS operators named Alibi and Maestro. Alibi projects inanimate holograms of herself, which expose the location of any enemy that interacts with the hologram with their weapons, body, or drone; Maestro can install a wall-mounted directed-energy turret that he can then operate remotely, damaging enemies with rapid laser fire. After a certain number of shots, the turret can overheat and has to cool down.[100]
	Operation Grim Sky — Season 3	September 4, 2018[101]	This operation introduced two new operators and the first full map redesign for Hereford Base. The first new operator is an attacker named Maverick[102] who uses a small handheld blowtorch to open new lines of sight as well as kill holes, even in reinforced walls to aid the attackers in breaching the objective. The second new operator is a defender called Clash[103] who is the first shield wielding defender. Her shield is similar to Montagne except she utilises technology designed by Mira and Twitch within her gadget; the CCE or Crowd Control Electro Shield. It emits an electric field that slows and damages attackers.[104]
	Operation Wind Bastion — Season 4	December 4, 2018[105]	This operation introduced a new map set in Morocco and two GIGR operators named Kaid and Nomad. Kaid, a defending operator, can throw a gadget called Electroclaws that can electrify reinforced surfaces, barbed wire, and deployable shields. On the attacking side, Nomad possesses a weapon attachment called an AirJab launcher, which launches proximity-triggered air-blast grenades that can stick to surfaces and throw opposing operators to the ground.[106]
Year 4	Operation Burnt Horizon — Season 1	TBA	This operation will introduce a new map set in outback Australia, along with two operators from SASR, Mozzie and Gridlock.[107]

Ubisoft also envisioned the game as an esports game. The company had their first meeting with David Hiltscher, vice president of ESL, in late 2013. ESL offered feedback on the game's balancing and helped the developer to ensure that the game was suitable for competitive play.^[108] The team focused on introducing new operators to provide variety for esports viewers after the game's release, a decision inspired by modern multiplayer online battle arena games such as Dota 2, as this type of game often has 80–100 playable characters.^[109] ESL and Ubisoft officially announced Tom Clancy's Rainbow Six Pro League, a global tournament for Windows and Xbox One players. The competition was held at Intel Extreme Masters eSports tournament on March 4, 2016.^[110] A European team, PENTA Sports, became the champion of the first season of Rainbow Six Pro League after defeating another team, GiFu, at the final of the tournament held in May 2016.^[111] In 2017, it was revealed that Pro League Year Two would return, but Xbox One tournaments would not be featured.^[112]Ubisoft also held the Six Invitational tournaments in 2017 and 2018, in which top teams competed for the top prize. The 2018 tournament attracted 321,000 viewers on Twitch.^[113] Both Nathan Lawrence from Red Bulland Richie Shoemaker from Eurogamer compared the game favourably with Counter-Strike: Global Offensive, with both being hopeful that Siege can dethrone Global Offensive's status as the most successful competitive esports first-person shooter in the future.^[114][115] Rainbow Six Siege Year 3 Season 4 was announced on November 18 at the Pro League Finals in Rio de Janeiro and is set in Morocco.^[116][117]