How to Play Lost Ruins of Arnak Solo Without the Expansion

Quick answer

You can play Lost Ruins of Arnak solo using only the base game. The official solo mode uses a rival system: you control one explorer while a rival deck simulates a second player. Set up the board for two players, give the rival its own deck and marker, then play through five rounds. The rival scores points based on its progress tracks, so you must balance exploration against blocking its advances.

What you need before you start

The base game includes everything required for solo play: the rival deck, rival marker, and solo rules reference. You do not need The Missing Expedition or any promo cards to play alone. If you own the Alicorn Promo Card, it adds a single card to your deck but is not required for solo mode.

Before your first solo game, separate the rival deck from the main deck. The rival deck has a distinct back, so shuffling it into the wrong pile is the most common setup mistake. Check the rulebook's solo section for the exact card counts, because mixing in even a few cards from the main deck will break the rival's behavior.

How the rival system actually works

The rival is not a full opponent. It does not take normal turns. Instead, at set moments during each round, you flip the top card of the rival deck and resolve its instructions. These instructions move the rival up the research tracks, place guardians, or block spaces on the board.

The rival's score comes from its position on the two research tracks at the end of the game. It does not collect artifacts, buy cards, or manage resources. This means your solo goal is different from multiplayer: you are racing to outpace a fixed scoring engine, not outmaneuvering a human. Understanding this changes how you value actions that slow the rival versus actions that simply score you points.

Setting up the board for solo play

Set up the board exactly as you would for a two-player game, including the two starting sites and the guardian spaces for two players. Place the rival marker on the starting space of each research track. Shuffle the rival deck and place it within reach.

One common checkpoint: the rival does not use a player board, resources, or a hand of cards. If you find yourself giving the rival resources or cards, you have added a step that does not exist. Keep the rival purely card-driven. This keeps solo play fast and prevents accidental rules bloat.

Playing the five rounds

Each round follows the normal turn order: you take your turn, then resolve the rival's card. The rival card tells you which track to advance, how far, and any side effects. After five rounds, the game ends and you compare your score to the rival's score.

A frequent mistake is resolving the rival card before finishing your own turn. Always complete your full turn first, including any free actions or item use, then flip the rival card. This order matters because some rival effects block spaces you might still want to use. If you flip early, you may accidentally deny yourself a legal move.

Solo strategy that works without expansion content

Because the rival advances on fixed tracks, you can predict its scoring pace. Early in the game, focus on building your deck and acquiring a second explorer. The rival will not punish a slow start as harshly as a human would, but it will steadily climb the tracks. Aim to have your engine running by round three.

Prioritize actions that both score you points and slow the rival. For example, taking a guardian that also blocks a rival advance is stronger in solo than in multiplayer. Do not ignore the rival's tracks entirely; check them at the start of each round. If the rival is one step from a major scoring threshold, spend a turn to push it back or race ahead on the other track.

Common solo rules mistakes to avoid

Do not treat the rival as a normal player. It does not take a turn, does not have resources, and does not use cards from the main deck. Another mistake is forgetting to advance the rival when instructed because you were focused on your own plan. Use the rival marker as a visual reminder.

Finally, do not assume the solo mode is easier. The rival scores efficiently if left alone. Many first-time solo players lose because they build a strong deck but ignore the rival's track position until it is too late. Check the tracks every round, not just at the end.

Solo setup steps

1. Separate the rival deck: Pull the rival deck from the main deck before shuffling. The rival deck has a distinct back. Mixing in even a few main-deck cards breaks the rival's behavior. Checkpoint: the rival deck should be clearly separate and shuffled on its own.
2. Set up for two players: Place the board, starting sites, and guardian spaces as if two players were playing. Place the rival marker on the start of each research track. Checkpoint: the rival does not get a player board, resources, or a hand of cards.
3. Take your turn first: Complete your full turn, including free actions and item use, before flipping the top rival card. Resolve the rival card's instructions exactly as written. Checkpoint: flipping the rival card early can block spaces you still needed.
4. Repeat for five rounds: After five rounds, the game ends. Compare your score to the rival's score, which comes from its position on the two research tracks. Checkpoint: track the rival's progress every round, not just at the end.

Base game and promo facts

• Lost Ruins of Arnak: Lost Ruins of Arnak combines deck building, worker placement, and resource management in a game of exploration and discovery. These three mechanics all matter in solo play. You still build a deck, place workers, and manage resources, but the rival adds a race element that changes how you value each action.
• Lost Ruins of Arnak - Alicorn Promo Card: The Alicorn Promo Card was originally available at Essen Spiel 2021 and is published by Czech Games Edition. This promo is optional for solo play. It adds one card to your deck but does not change the solo rules or rival system. If you want a slight deck variation, it is a cheap addition, but it is not required to play alone.